CPE full system and noise.

[mustangman]

I thought it would be a good idea to post this before hand and talk about a before and after effect.

I just bought a CPE intake and am getting the Downpipe w/cat and exhaust with extra resonator installed within the next few days. The CAI sounds amazing, as many of you know, but I tend to drive an older crowd around for work. (Sales Manager and I take Presidents of companies out for lunch, etc.) I can almost hear some customers ask, "Jim, what the hell is that noise". Now of course I will laugh and call then old... :) but I was thinking of a solution for this.

In talking with Jordan from CPE, he also thinks this will work great. A product called Dynashield from the company that makes Dynamat. I've called and researched pricing and it’s not expensive at all. ($20.00 for a spray on, $125 installed.) And I hope to get this done Friday or Saturday.

I'd love to hear your thoughts on how I can measure the noise before and after so that I can help anyone else with such a decision.

Lastly, CPE and Jordan specifically, what an amazing group of people. Jordan has taken quite a bit of his time and knowledge to help me through many idea's I have with the Speed6. Never once did I feel like I was bothering him and the encouragement I was given was great. I just wanted to say thank you for great products and great support.


Jim

[jdub260]

If you wanna meet me halfway I can "borrow" a Db tester from work on a day to day basis. It would be ~80 mile trip each way, and we would have to make the trip twice(once before and once after), but it could be worth it for measured results.

Or you could just buy one for ~$100.
http://www.soundlevelmeters.net/digital-sound-level-meters/q350.shtml

[Gandalf]

Radioshack sells the most widely used SPL meter available in both analog and digital versions. Go grab the digital one for about $50. Alot of audio people use them to tune their high priced HT systems, they work very well.

[mustangman]

Jdub260, thank you, that would be a great way to at least show the DB levels. I have one from my old racing days (Needs to measure DB for certain classes.) I'll double check that it stills works, and if not I'll go grab one from Radio Shack. (Thanks Gandalf). Either way, thank you for offering to drive and let me borrow it. I'll let you guys know soon. Also, anyone else that needs additional info, let me know and I'll do my best to make it happen.

Jim

[MUSOM]

I'll be one to tell you, I've had the CPE CAI, downpipe, and catback exhaust system with extra Kooks 14'' muffler for about 6 months. Performance is a 10/10. However, it is loud. You'll have a drone the majority of the time, and it can become very annoying with company in your ride. I would do anything to get rid of the resonating sound. So beware....it is loud.

[jdub260]

Jdub260, thank you, that would be a great way to at least show the DB levels. I have one from my old racing days (Needs to measure DB for certain classes.) I'll double check that it stills works, and if not I'll go grab one from Radio Shack. (Thanks Gandalf). Either way, thank you for offering to drive and let me borrow it. I'll let you guys know soon. Also, anyone else that needs additional info, let me know and I'll do my best to make it happen.

Jim

Not a problem mustangman, anything to help out the MS6 community. :D

Besides who doesn't love road trips. (drive2)


Radioshack sells the most widely used SPL meter available in both analog and digital versions. Go grab the digital one for about $50. Alot of audio people use them to tune their high priced HT systems, they work very well.

Good info Gandalf, I never thought to look there. (first)

[www.cp-e.com]

I thought it would be a good idea to post this before hand and talk about a before and after effect.

I just bought a CPE intake and am getting the Downpipe w/cat and exhaust with extra resonator installed within the next few days. The CAI sounds amazing, as many of you know, but I tend to drive an older crowd around for work. (Sales Manager and I take Presidents of companies out for lunch, etc.) I can almost hear some customers ask, "Jim, what the hell is that noise". Now of course I will laugh and call then old... :) but I was thinking of a solution for this.

In talking with Jordan from CPE, he also thinks this will work great. A product called Dynashield from the company that makes Dynamat. I've called and researched pricing and it’s not expensive at all. ($20.00 for a spray on, $125 installed.) And I hope to get this done Friday or Saturday.

I'd love to hear your thoughts on how I can measure the noise before and after so that I can help anyone else with such a decision.

Lastly, CPE and Jordan specifically, what an amazing group of people. Jordan has taken quite a bit of his time and knowledge to help me through many idea's I have with the Speed6. Never once did I feel like I was bothering him and the encouragement I was given was great. I just wanted to say thank you for great products and great support.


Jim


(drive)


Thanks so much for the compliments AND the feedback. Let me know how things go!


Jordan

[mustangman]

Ok, well I have the baseline numbers finally... I'm sorry this took so long, I've been out of town for a long time.

As I returned home, I stopped by and had the Catted DP and CPE exhaust put on as well. Nice power form both, but LOUD as hell. I spoke with Josh at CPE and he sold me a 12" oval muffler to try. I'll get the baselines for sound on the full system ASAP, but here is the baseline.

Stock with CPE CAI:

Cabin @ idle - 69 dbs
Cabin @ 40mph - 86 dbs
Cabin @ 70 mph - 96
CAI (measured outside the car) rev to 4k rpm - 92 dbs
Exhaust (Stock) @ idle - 79 dbs
Cabin rev to 4k RPM - 80 dbs

I plan to get baselines with DP and CPE Exhaust and post as well, then post for the 12" oval add on muffler, then finally get the Dynomat and see the change from the above readings.

Again, I apologize for the delay, I blame work... (bird)

Lastly, CPE, thank you for all your help. You guys are the best.

Jim

[www.cp-e.com]

Ok, well I have the baseline numbers finally... I'm sorry this took so long, I've been out of town for a long time.

As I returned home, I stopped by and had the Catted DP and CPE exhaust put on as well. Nice power form both, but LOUD as hell. I spoke with Josh at CPE and he sold me a 12" oval muffler to try. I'll get the baselines for sound on the full system ASAP, but here is the baseline.

Stock with CPE CAI:

Cabin @ idle - 69 dbs
Cabin @ 40mph - 86 dbs
Cabin @ 70 mph - 96
CAI (measured outside the car) rev to 4k rpm - 92 dbs
Exhaust (Stock) @ idle - 79 dbs
Cabin rev to 4k RPM - 80 dbs

I plan to get baselines with DP and CPE Exhaust and post as well, then post for the 12" oval add on muffler, then finally get the Dynomat and see the change from the above readings.

Again, I apologize for the delay, I blame work... (bird)

Lastly, CPE, thank you for all your help. You guys are the best.

Jim


Well we really appreciate you posting empirical data for one of our products, so thank you :D

Just so we're clear, would you mind listing which exhaust combination you're running? Was this with one muffler or two? Catted downpipe or offroad?

Thanks! :)


Jordan

[mustangman]

No problem Jordan, the system on the car right now is:

A Catted Downpipe with a CPE exhaust and (1) 14" resonator. It is the 3 piece system. (confirmed earlier)

Next tuesday, the 10th, I should be receiving a 12" Oval muffler from CPE. I plan to do a before and after for decibel levels. If this isn't "perfect" for me, I may add another 12" oval muffler, a "Y" to the 3" setup and put that muffler on the other side.

For anyone looking pure performance, it is an amazing difference from stock, as I said before CPE is quality all the way.

[LBV]

I would do anything to get rid of the resonating sound.

Try putting in a round resonator in the middle under the car ... something like part # 14616 on the Magnaflow website.

[MUSOM]

I agree completely. I am in the exact same situation, but my plan of action is slightly different. I have CPE CAI, Downpipe, and catback system with the extra 14'' muffler. I am talking the iniative to tweak my system, and will be working this week to try to fit a 24" flow through muffler onto my current setup. I'm not the best welder in the world, but I'm gonna see what I kind of damage I can do! (evil) If I'm not completely satisfied, my next step will be the spray on dynoshield. I'm very curious to hear results from mustangmans muffler addition and especially if he adds the dynoshield. I would even consider taking my system back to dual exhaust and add another muffler to the other side. Performance is killa though (breakn) Keep me posted on those db readings!!!!







No problem Jordan, the system on the car right now is:

A Catted Downpipe with a CPE exhaust and (1) 14" resonator. It is the 3 piece system. (confirmed earlier)

Next tuesday, the 10th, I should be receiving a 12" Oval muffler from CPE. I plan to do a before and after for decibel levels. If this isn't "perfect" for me, I may add another 12" oval muffler, a "Y" to the 3" setup and put that muffler on the other side.

For anyone looking pure performance, it is an amazing difference from stock, as I said before CPE is quality all the way.

[www.cp-e.com]

No problem Jordan, the system on the car right now is:

A Catted Downpipe with a CPE exhaust and (1) 14" resonator. It is the 3 piece system. (confirmed earlier)

Next tuesday, the 10th, I should be receiving a 12" Oval muffler from CPE. I plan to do a before and after for decibel levels. If this isn't "perfect" for me, I may add another 12" oval muffler, a "Y" to the 3" setup and put that muffler on the other side.

For anyone looking pure performance, it is an amazing difference from stock, as I said before CPE is quality all the way.


You're the man (headbang)



I agree completely. I am in the exact same situation, but my plan of action is slightly different. I have CPE CAI, Downpipe, and catback system with the extra 14'' muffler. I am talking the iniative to tweak my system, and will be working this week to try to fit a 24" flow through muffler onto my current setup. I'm not the best welder in the world, but I'm gonna see what I kind of damage I can do! (evil) If I'm not completely satisfied, my next step will be the spray on dynoshield. I'm very curious to hear results from mustangmans muffler addition and especially if he adds the dynoshield. I would even consider taking my system back to dual exhaust and add another muffler to the other side. Performance is killa though (breakn) Keep me posted on those db readings!!!!


This is great, we'll have two different guys trying some different muffler combinations (cabpatch)

I assume the visit to the welding place this morning was a success?


Jordan

[mustangman]

Try putting in a round resonator in the middle under the car ... something like part # 14616 on the Magnaflow website.


The only problem I see with this part is that it is a 2-1/2" and the CPE system is a 3". The exhaust flow would be restricted and performance would suffer a bit from this. Just my $0.02.

Jim

[MUSOM]

So, because of mustangman's authoratative altruism, I've decided to go to pick up a db meter at radioshack myself here in a few hours. It would be nice to do a little head-to-head comparison and see what db level I'm at currently and compare it to some mod. Just a little FYI, I should be posting results today or tomorrow.

[mustangman]

So, because of mustangman's authoratative altruism, I've decided to go to pick up a db meter at radioshack myself here in a few hours. It would be nice to do a little head-to-head comparison and see what db level I'm at currently and compare it to some mod. Just a little FYI, I should be posting results today or tomorrow.


Look at Musom using the $50 words. (rockon) If need be Musom, I can let you borrow mine, we aren't too far away from each other. Just let me know bud.

Jim

[MUSOM]

Bummer. I just got back from radioshack an hour ago. I tried it out on the way home, and it seems that I'm getting just about the same readings you are. It seems that I was averaging between 90-94 db in conservative driving and in the upper 90's with aggressive driving. I even had peaks at around 108 db at WOT. Idle seemed about the same as yours. I'll get out this evening and get some more accurate reading and maybe even a vid post. thanks for the offer.

Is this the same meter you have?

http://pic30.picturetrail.com/VOL1486/7570143/15949500/243383592.jpg




Look at Musom using the $50 words. (rockon) If need be Musom, I can let you borrow mine, we aren't too far away from each other. Just let me know bud.

Jim

[LBV]

The only problem I see with this part is that it is a 2-1/2" and the CPE system is a 3". The exhaust flow would be restricted and performance would suffer a bit from this. Just my $0.02.

Jim

You're right there, but they do have a 3" as well I believe.

[mustangman]

Bummer. I just got back from radioshack an hour ago. I tried it out on the way home, and it seems that I'm getting just about the same readings you are. It seems that I was averaging between 90-94 db in conservative driving and in the upper 90's with aggressive driving. I even had peaks at around 108 db at WOT. Idle seemed about the same as yours. I'll get out this evening and get some more accurate reading and maybe even a vid post. thanks for the offer.

Is this the same meter you have?

http://pic30.picturetrail.com/VOL1486/7570143/15949500/243383592.jpg

Yup, I have the same meter. I will do my tests with it ASAP, its snowing here and I'm trying to finish up work. I'll get em soon guys, hopefully today.

Jim

[mustangman]

Stock with CPE CAI:

Cabin @ idle - 69 dbs
Cabin @ 40mph - 86 dbs
Cabin @ 70 mph - 96
CAI (measured outside the car) rev to 4k rpm - 92 dbs
Exhaust (Stock) @ idle - 79 dbs
Cabin rev to 4k RPM - 80 dbs

Test Conditions:
All windows up, car at 600-700 rpm Idle, Mild to no wind.



CPE CAI - CPE Exhaust w/14" resonator - CPE DP w/Cat
Cabin @ Idle - 80
Cabin @ 40 MPH - 90
Cabin @ 70 MPH - 98
Outside Driver window - Rev to 4,000 RPM - 99
Exhaust @ Idle - 105
Cabin Rev to 4,000 RPM - 93
Cabin @ hard accel - 1-2 Gear - 105

I added a Hard accel line to show how loud it is, also note the cabin @ Idle and Exhaust @ Idle (measured from outside 6" from exhaust tip).

Jim

[Gandalf]

105 seriously? Those are ridiculously high Db levels...

[mustangman]

105 seriously? Those are ridiculously high Db levels...

Yup, and I'm too old for that noise, I really hope the 12" Oval Muffler will help. Drone is there as well, truthfully, it gets to the point of giving me a headache.

Full plan is, 12" Oval addition on the right side. If that Doesn't help enough, maybe another 12" Oval on the left side with custom "Y" pipe to make the system a dual exhaust. Then lastly, I plan to add Dynamat or Dynashield.

I will have the first 12" Oval on Monday or Tuesday and have it installed immediately. I'll keep you posted.

Jim

[zumzumzoom03]

What are the stock exhaust's db level for comparison?

[mustangman]

What are the stock exhaust's db level for comparison?


Read my quote for the last DB levels bud, its all in there.

Jim

[mustangman]

I feel the need to clarify myself here. I don't want this post to, in any way, bash CPE. The truth is, the exhaust sounds amazing and is built with the highest quality. But, with my work, I drive people around for lunch/dinner meetings and they are an older crowd. To respect them I am trying to decrease the sound a bit.

Some might ask, why would I even buy the CAI, DP and Exhaust then. As I said above, I drive a lot and I want something fun and fast to drive. Secondly, I'm a performance freak, I've owned Mustang Cobra's and Ford Lightning's... none were close to stock when they left my garage. I and, I'm sure my customers, could deal with a little sound. I just can't help myself.

My goal, in all this, is to keep most of the performance, while getting Exhaust Idle down to around 85 dps and interior to 86-88 dps in normal driving. And maybe show others how to keep performance while keeping the sound down to comfortable. Thanks for listening.

Jim

[MUSOM]

I am, once again, in the same boat as mustangman. As I went to the weld/body shop this morning to do some more precise measurements for my muffler addition/rearrrangment, the fellas at the body shop even commented on the craftmanship of the CP-E system. And they were shaking their head with the thoughts of me adding an additional muffler. (As they thought it sounded great). I am a student doctor and am trying to maintain some degree professionalism while driving around town to meet patients and such. Five years ago I would have given my right arm for a system that sounded this good.

D

[MUSOM]

So here is a little representation of a good way to waste time in Huntington, WV. This is gonna be a good little experiment to see if I can quiet down my exhaust. So I've found a company in Florida that makes a 24" long, 4" round muffler. It is 28" in length and is what they fabricated for a dodge viper side exhaust system. I've made some meaurements and it looks like it will be a good fit in the middle section of my current setup. I currently have two matching 14" mufflers (one in the middle and one at the end) of which I still want to utilize. So, I have decided to go back to a dual system and throw those mufflers on the end section of each side. It's gonna take a little bending, tweaking, welding and probably a helluva lot of patience.

Also, please note that these a photos were copied and pasted from the CP-E website, and it is not a current photo of my car. It is only for representative purposes.

http://pic30.picturetrail.com/VOL1486/7570143/15949500/243711660.jpg

http://pic30.picturetrail.com/VOL1486/7570143/15949500/243711680.jpg

http://pic30.picturetrail.com/VOL1486/7570143/15949500/243711668.jpg

[TC2.3]

seems like a lot of work

[MUSOM]

So here's todays results of my db readings.

outside drivers window at 2,000rpm: 89db
outside drivers window at 3,000rpm: 98db
outside drivers window at 4,000rpm: 95db
exhaust at idle: 107db (6" away from pipe)
cabin at idle: 74db, but decreased to 67db after car warmed up
cabin at 40mph: 90db (6th gear)
cabin at 70mph: 88db (6th gear)
cabin at 4,000rpm: 90db (1st gear)
cabin at 4,000rpm: 93db (2nd gear)
cabin at 4,000rpm: 88db (3rd gear)
cabin at 4,000rpm: 95db (4th gear)
cabin at 4,000rpm: 94db (5th gear)
cabin under hard accel: consistently above 100db, peak at 108db

Also, something I noticed, the drone seems a more significant under deceleration that acceleration. For example, when I let off of the acclerator, my readings were about 5db more than under steady accleration, while staying in the same gear.

I have two of the 14" muffler/resonators currently, so this should give mustangman an idea of what to expect after the addition of another 14" muffler. Hope this helps.

D

[kmh001]

So here's todays results of my db readings.

outside drivers window at 2,000rpm: 89db
outside drivers window at 3,000rpm: 98db
outside drivers window at 4,000rpm: 95db
exhaust at idle: 107db (6" away from pipe)
cabin at idle: 74db, but decreased to 67db after car warmed up
cabin at 40mph: 90db (6th gear)
cabin at 70mph: 88db (6th gear)
cabin at 4,000rpm: 90db (1st gear)
cabin at 4,000rpm: 93db (2nd gear)
cabin at 4,000rpm: 88db (3rd gear)
cabin at 4,000rpm: 95db (4th gear)
cabin at 4,000rpm: 94db (5th gear)
cabin under hard accel: consistently above 100db, peak at 108db

Also, something I noticed, the drone seems a more significant under deceleration that acceleration. For example, when I let off of the acclerator, my readings were about 5db more than under steady accleration, while staying in the same gear.

I have two of the 14" muffler/resonators currently, so this should give mustangman an idea of what to expect after the addition of another 14" muffler. Hope this helps.

D


Hope I'm not telling you guys what you already know, but I find a lot of people don't understand how the dB scale works....

So just in case you didn't know, every 3dB increase means a doubling of the sound level.

[mustangman]

So here's todays results of my db readings.

outside drivers window at 2,000rpm: 89db
outside drivers window at 3,000rpm: 98db
outside drivers window at 4,000rpm: 95db
exhaust at idle: 107db (6" away from pipe)
cabin at idle: 74db, but decreased to 67db after car warmed up
cabin at 40mph: 90db (6th gear)
cabin at 70mph: 88db (6th gear)
cabin at 4,000rpm: 90db (1st gear)
cabin at 4,000rpm: 93db (2nd gear)
cabin at 4,000rpm: 88db (3rd gear)
cabin at 4,000rpm: 95db (4th gear)
cabin at 4,000rpm: 94db (5th gear)
cabin under hard accel: consistently above 100db, peak at 108db

Also, something I noticed, the drone seems a more significant under deceleration that acceleration. For example, when I let off of the acclerator, my readings were about 5db more than under steady accleration, while staying in the same gear.

I have two of the 14" muffler/resonators currently, so this should give mustangman an idea of what to expect after the addition of another 14" muffler. Hope this helps.

D

Thanks Musom, the more I look at this, the more I'm thinking the Dynashield/mat is going to be the way to go. Hopefully the 12" oval muffler will help a bit more than the two 14" resonator's you have. I still plan to have this done by Tuesday. LOL Whoever gets this car when I sell it in a few years is going to get one nice ride.

Jim

[MUSOM]

I hear ya. I sure hope that I won't have to install the dynoshield/mat. I'm banking that this 24" muffler will do some serious good, and hoping my expectations aren't too high. When I added my second 14" muffler, to be honest, it made only a slight difference. I could tell the difference myself, but noone else seemed to notice, including the guys who let me borrow their weld shop. Good luck to ya.

[mustangman]

Stock with CPE CAI:

Cabin @ idle - 69 dbs
Cabin @ 40mph - 86 dbs
Cabin @ 70 mph - 96
CAI (measured outside the car) rev to 4k rpm - 92 dbs
Exhaust (Stock) @ idle - 79 dbs
Cabin rev to 4k RPM - 80 dbs


Test Conditions:
All windows up, car at 600-700 rpm Idle, Mild to no wind.



CPE CAI - CPE Exhaust w/14" resonator - CPE DP w/Cat
Cabin @ Idle - 80
Cabin @ 40 MPH - 90
Cabin @ 70 MPH - 98
Outside Driver window - Rev to 4,000 RPM - 99
Exhaust @ Idle - 105
Cabin Rev to 4,000 RPM - 93
Cabin @ hard accel - 1-2 Gear - 105


CPE CAI - CPE Exhaust w/14" resonator & 12" Oval muffler - CPE DP w/Cat
Cabin @ Idle - 72
Cabin @ 40 MPH - 86
Cabin @ 70 MPH - 94
Outside Driver winder rev to 4,000 RPM - 95
Exhaust @ Idle - 98
Cabin Rev to 4,000 RPM - 90
Cabin @ Hard Accel - 1-2 Gear - 102

This 12" Oval helped a ton, drone is way down, and as is shows above DBs are down very close to stock. Under hard accel and spirited driving the exhaust note is still there, albeit less noise. I am very pleased with the results and plan to still do Dynamat/Shield to make the cabin very quiet, that will also be followed with DB levels.

I am attaching pictures of the system, this will show others the quality I always speak of when it comes to CPE... I mean, look at the welds, those alone are beautiful. Josh, Jordan, and Anthony... thank you guys for all your help and always taking the time to talk with me.

Jim

[Klip]

Mustangman, do you have the CP-E downpipe too? And is this 12 inch oval muffler from CP-E? Looks like you have found my solution also. I will have to give CP-E a call this week. Thanks a ton for all the testing.
I have the complete CP-E exhaust(DP & Catback w2/14 inch resonators).

[mustangman]

Yes, I have the DP w/Cat. Also, please note these tests were taken directly after installation. Once the muffler has been on a week or so it should get quieter.

Lastly, I didn't notice any decrease in power, the 12" oval is straight through, so if anything it is very marginal.

Jim

[mustangman]

One other thing I forgot to mention. To make the 12" Oval fit better and with no rubbing, the heat shield must be bent in a touch. The is plenty of room behind the heat shield, and all we are talking is a couple taps with a hammer to bring it in about 1/4"

Jim

[MUSOM]

Hey KLIP, i think we have the exact same setup. I'll be installing a 24" straight through muffler system within a week or 10 days. If you are looking for some serious sound dampening and can hold off for a couple of weeks, I'll be more than happy to let you know how this 24" additional muffler works for me. Stay tuned,

D





Mustangman, do you have the CP-E downpipe too? And is this 12 inch oval muffler from CP-E? Looks like you have found my solution also. I will have to give CP-E a call this week. Thanks a ton for all the testing.
I have the complete CP-E exhaust(DP & Catback w2/14 inch resonators).

[Gandalf]

Very nice - thanks for the leg work and all the measurements. I am very surprised though at the 98 dB at idle reading is that a correct measurement? Thats almost 20 dB higher then stopck while all the other measurements were much closer.

[mustangman]

Very nice - thanks for the leg work and all the measurements. I am very surprised though at the 98 dB at idle reading is that a correct measurement? Thats almost 20 dB higher then stopck while all the other measurements were much closer.


Yes, that is a correct reading, but its also 7 DBs lower than original. It was also read, immediatley after installation, so it should go down a bit once the exhaust packing is set.

The drone is way down, if not very close to stock, there is a decel drone... but I think its expected with an aftermarket exhaust. Overall though, I'm extremely pleased with the results, and I'm a bit of a perfectionist... all I can say is trust me on this, you'll notice the difference immediatley.

Next step is still the Dynamat, and talking to them directly, I am to expect a 12 DBs decrease on the inside throughout the tests above.

Jim

[mdogg]

Lastly, I didn't notice any decrease in power, the 12" oval is straight through, so if anything it is very marginal.

How long did you have the CPE catback on the MS6 before modding it? Did you completely adjust to the power so that you would easily recognize any drop-off?

The only reason I ask is that the shape of the new 12" oval muffler seems to stick out quite a bit compared to the stock 14" on that 3rd section. Also, the ends are square instead of angled to allow for smoother airflow. I would be very interested if CPE could get some dyno runs with this new muffler before offering it. Yes, it might make things dramatically quieter, but silence comes at a cost. My guess is that with the square ends you are losing some of the power. Just my $0.02.

[www.cp-e.com]

How long did you have the CPE catback on the MS6 before modding it? Did you completely adjust to the power so that you would easily recognize any drop-off?

The only reason I ask is that the shape of the new 12" oval muffler seems to stick out quite a bit compared to the stock 14" on that 3rd section. Also, the ends are square instead of angled to allow for smoother airflow. I would be very interested if CPE could get some dyno runs with this new muffler before offering it. Yes, it might make things dramatically quieter, but silence comes at a cost. My guess is that with the square ends you are losing some of the power. Just my $0.02.


FWIW, I posted a picture of the inside of the oval muffler in the SPEED3 forums and neglected to post it here! Anyway, here are the pictures of the oval muffler, inside and out. The inside of the oval muffler is indentical to the inside of the resonators, so the performance difference should be negligible.

http://www.mustangmods.com/ims/u/535/644/143037.jpg

http://www.mustangmods.com/ims/u/535/644/143036.jpg


Jordan

[mustangman]

How long did you have the CPE catback on the MS6 before modding it? Did you completely adjust to the power so that you would easily recognize any drop-off?

The only reason I ask is that the shape of the new 12" oval muffler seems to stick out quite a bit compared to the stock 14" on that 3rd section. Also, the ends are square instead of angled to allow for smoother airflow. I would be very interested if CPE could get some dyno runs with this new muffler before offering it. Yes, it might make things dramatically quieter, but silence comes at a cost. My guess is that with the square ends you are losing some of the power. Just my $0.02.

Mdogg, what do you mean "square ends"? The oval muffler is, oval in shape, and straight through design. (Jordan, maybe you could post a picture or two of this muffler. I didn't think to do it before installation.) You could mean that the 12" muffler isn't flush and is mounted sideways... I don't see how this would increase any power loss.

Anyway, I had the system for 1 week before the 12" install, and I drive for a living so I spent quite a bit of time in the car in that one week. At max, I'd say.... MAX 5 hp loss.

If this was a chambered muffler I could understand your thoughts, but with a straight through design, power loss isn't coming from adding this muffler. It only helps the sound, because it acts like a resonator (bouncing the sound off the muffler packing to minimize noise.) but in larger form. (12" oval vs. 14" long x 6" wide resonator) Here are two pictures also to show it from ground level, and inside the opening. I hope this helps Mdogg. If not, Jordan is watching this post, he may be able to help as well.

Lastly, imo, if you want pure power and don't care about how loud it is, go with the regular system. But if you want power and want it a bit quieter, this is one way to go. I just want to help anyway I can. Thanks again though for the great question and I hope I answered them.

[mustangman]

LOL, Jordan, are you reading my mind now? As soon as I clicked "submit" asking for pics, the are already there.... (thumb)

Jim

[mdogg]

Thanks Jordan and Jim! I didn't see those pics from the speed3 forums..... the muffler choice looks good and you are right! You definitely shouldn't be losing much in terms of power. I guess I read it quickly and only saw the outer design of the muffler. (my bad)

I actually already have the CPE catback with only the 14" muffler (and LOVE it!). I have the straight-pipe 3rd section hooked up now in case it gets too loud I can make it quieter if I needed to. I might need to do that swap once I install (if I ever receive) the SU test pipe. But if things ever get too loud after that, it's good to know there will be another good option from a trusted source!

[www.cp-e.com]

LOL, Jordan, are you reading my mind now? As soon as I clicked "submit" asking for pics, the are already there.... (thumb)

Jim


After we spoke on the phone I read mdogg post one more time and I understood what he was looking for (woops!). Thanks for posting pics from behind. I was curious if you could see the muffler from the rear too.



Thanks Jordan and Jim! I didn't see those pics from the speed3 forums..... the muffler choice looks good and you are right! You definitely shouldn't be losing much in terms of power. I guess I read it quickly and only saw the outer design of the muffler. (my bad)

I actually already have the CPE catback with only the 14" muffler (and LOVE it!). I have the straight-pipe 3rd section hooked up now in case it gets too loud I can make it quieter if I needed to. I might need to do that swap once I install (if I ever receive) the SU test pipe. But if things ever get too loud after that, it's good to know there will be another good option from a trusted source!


I'm so glad to hear that! Since Jim has been somewhat of an MS6 pioneer, we now know that we can incorporate this 12" oval muffler into our modular rear section. So if you do require a quieter muffler option once you install the test pipe, I think we should have what you need by then.

Thanks again Jim!! (headbang)


Jordan

[Klip]

Musom, will do and thanks.
Mustangman you too, appreciate both of you testing these options.

[mustangman]

I just bought some Dynamat Xtreme, and it will be delivered 4/16/07. My plan is to install it in the trunk first, and I'll do more DPs readings. If needed I will move on from there. I'll be sure to post again ASAP.

Also, if anyone is looking to buy that stuff, shoot me a PM for the place to get the best price.

Jim

[mustangman]

Dynamat installed in trunk:
Cabin @ Idle - 70
Cabin @ 40mph - 84
Cabin @ 70mph - 93
Cabin rev to 4,000 rpm - 89
Cabin hard accel 1-2nd gear - 100

These numbers are from Dynamat in the trunk floor only, I underestimated the time involved here and plan to do the rest possibly tomorrow. I will keep you posted.

Jim



CPE CAI - CPE Exhaust w/14" resonator & 12" Oval muffler - CPE DP w/Cat
Cabin @ Idle - 72
Cabin @ 40 MPH - 86
Cabin @ 70 MPH - 94
Outside Driver winder rev to 4,000 RPM - 95
Exhaust @ Idle - 98
Cabin Rev to 4,000 RPM - 90
Cabin @ Hard Accel - 1-2 Gear - 102

This 12" Oval helped a ton, drone is way down, and as is shows above DBs are down very close to stock. Under hard accel and spirited driving the exhaust note is still there, albeit less noise. I am very pleased with the results and plan to still do Dynamat/Shield to make the cabin very quiet, that will also be followed with DB levels.

I am attaching pictures of the system, this will show others the quality I always speak of when it comes to CPE... I mean, look at the welds, those alone are beautiful. Josh, Jordan, and Anthony... thank you guys for all your help and always taking the time to talk with me.

Jim

[MUSOM]

NICE. how long did it take you to do the trunk itself? got anything else installed?