varying custom exhausts

[warrier04]

would a local muffler shop be able to develop a downpipe (2.5in prob) for my msp? ive searched different threads, and most people seem to be choosing catless, but would it be possible to custom make a downpipe with a cat? i was thinking if i got new exhaust piping (2.5), could i use one of the 2 cats the car already has to put the in the downpipe and go the route of a downpipe back exhaust? would putting the cat in the larger downpipe defeat the purpose of making the downpipe larger in the first place? thanks for any productive input.

drew (boom07)

[Dr.Sound]

dude, dont cut your stock pipe.
shop should be able to fabricate a downpipe for you, and instead of using your stock cats (which are like 1.5 inch diameter inside, and will render the DP useless) get a hi-flow cat from Magnaflow, or a cheaper Catco.

[warrier04]

about how much of a dent would a decent cat put it my wallet? also, does anyone have any idea the loudness of a downpipe back setup with a straight pipe (no muffler) ? is there a thread out ive yet to find with a clip ?

[Dr.Sound]

this is the one i'm ordering for my catless DP, it's 2.5 inch magnaflow:
http://www.completeexhaust.com/product_info.php?manufacturers_id=49&products_id=408

u can also find a Catco cat for arround $30 on ebay.......but people say they dont last long.

[warrier04]

sorry for confusion, but is a downpipe back set up different than a setup with a downpipe that leads to hi flow cat back?

[Dr.Sound]

stock:
turbo------downpipe (with cats)------resonator-------muffler

downpipe is just a piece of pipe that has cats on it (stock)
i have a catless aftermarket DP followed by stock resonator then by an aftermarket muffler.

to add a cat to the DP u have to cut out a portion of it and weld the cat on.

[warrier04]

would a straight pipe from the downpipe back be pretty loud? also, what kind of gains (hp, gas mileage, etc) , on average, should be expected - i mean...for a daily driver that hasnt been and prob wont go to the track, is a mod like a replacement downpipe feasible? my final goal is to have a mean, true turbo sounding car and some extra get up and go

[Dr.Sound]

replacing the cats is probably the best thing u can do to a turbo car.
turbo will spool faster, this will eliminate any sort of lag......
they say the power increase is arround 18-22 whp stock. more with increased boost.
since the power curve changes u dont have to gas it to get the same power, hence better gas milage.

freeing up the exhaust also makes it safer to boost more.

no muffler will be loud as hell,
it will also sound raspy and will backfire a lot.

[marashka]

mmmmmm backfires, that alone worth getting a downpipe :D

[Dr.Sound]

mmmmmm backfires, that alone worth getting a downpipe :D(yes)

[z00mer]

Does anybody on this board have the Magnaflow system made for the MSP? And if so....how's the performance?

Sorry for all the noob questions.

[marashka]

i got a highflow magnaflow resonator on my costum turboback, works great, did not notice any decrease in performance whatsoever after i put it in, just deeper and less raspy sound.

[Dr.Sound]

local monkey arround here, named krillin (louie), has a magnaflow cat-back.
his car was used for prototyping.

pm him if u have any questions.

spicySRT4 (steph) had her car used for prototyping for magnaflow as well.
she got the cat-back, but didnt like the sound.....a little too raspy at higher RPM's.......so she sold it.





P.S.
(rofl)
LMAO
hey u guys, try typing "spicyMSP" without quotes.......see what happenes
*good shit t3ase* :D

[krillin]

who u callin a monkey, you donkey! HEE HAW!!!@#@$

[on point]

first questions is... would the cel come on even with a highflo cat welded onto a custom dp?

one more.. Could the shop making your exhaust setup make it so the custom exhaust could be unbolted and taken off whenever? of would the peice have to be welded on?

[mattybo]

first questions is... would the cel come on even with a highflo cat welded onto a custom dp?

one more.. Could the shop making your exhaust setup make it so the custom exhaust could be unbolted and taken off whenever? of would the peice have to be welded on?

Why would you go through all that trouble? Get an apex dp with a high flow cat. Then get whatever cat-back system your little heart desires, custom, greddy, Corksport, HKS...whatever. Just make sure you keep your stock system so in a couple of years when you get that emissions notification you can drop your stock setup back on and pass the test.

I spent 100 on the Magnaflow muffler with tip, 280 on the DP (with no cats) and 180 to have it all put on and have pipes ran from the DP to the muffler. Obviously they arent mandrel bends but the damn thing sounds perfect and ill find out how much HP it added when i bring my car to agile auto in a week or so to get it dynoed.

[Striker187]

the cel shouldn't come on so long as the o2 sensor is the correct place (AFTER the cat). and yeah, a shop should be able to make it so you can unbolt it whenever you please.

[Dr.Sound]

...........and yeah, a shop should be able to make it so you can unbolt it whenever you please.exactly.
but it would cost more because of the flanges that have to be welded onto the pipes.
this is how i had mine done.
i can take everything off at home in about 30 min with just 2 jackstands.

[biochembruin]

On the apex downpipe with high-flow cat, what brand is the high-flow cat? ie: Magnaflow, Catco, etc.?

[mattybo]

On the apex downpipe with high-flow cat, what brand is the high-flow cat? ie: Magnaflow, Catco, etc.?

you can get an apex downpipe with a highflow cat on it...or at least i thought so.

[Dr.Sound]

i think apex uses catco.

IMHO catco cats are too cheap and dont last long.
i did quite a bit of reaserch on cats......mostly talked to people on NASIOC.
they all told me that catco cats dont last long, at least the cheap ones.
there are 2 kinds, ceramic (cheap) and metallic (more expensive)
metallic catco is arround $100-120.

i just ordered a magnaflow hi-flow 2.5 inch cat........mirror finish :D

[biochembruin]

I went to apex's website (http://www.apexr1.com), and sent an e-mail to the address provided for questions. They responded that they use a Magnaflow cat in the downpipe for the MSP. Hope it's true.

[Swerny]

FYI, FWIW.
I went to a local performance exhaust shop on Friday to see if they could make me an exhaust. They do everything for any car/truck, so it's not Midas or Meineke. The shop is called Hot Rod Scott's in Toronto.
First off, as Dr. Sound said, the flange at the front of the DP would be expensive to make. The guy said it would probably be $80-90 CDN for just the flange.
I told him the prices of the DP in the US,and he said "for that price, but it from them and we can install it for you".
The same thing was said about a cat back. When i told him about the Corksport S/S cat back for $330, he told me I was crazy if i didn't buy it.
I asked about hi-flow cat's since i need to have one added to whatever set up i decide to run.
He told me that he would ONLY recommend Random Technology cats. They are pricey($275 Cdn), but they will last.
According to him ,the Maganflow cats will not handle the heat from the FI exhaust and will be cooked within a year. The Catco's were even worse, and he told me to stay away from them. He explained it would be better to get it done once properly, than yearly improperly.
Interesting to say the least. (band2)

[Notorious_V.I.C]

thats good to know they (apex) hopefully uses a Magnaflow cat, i was and am still thinking of getting the dp w/hi-flow cat. just the price seems big...$399.99?! and then theres shipping

[Notorious_V.I.C]

hmm.thats very interesting about the cats thing on how long they would last....i might get a custom one down.once i have enough funds..

[Dr.Sound]

well first off i know a lot of subaru guys that have been running magnaflow cats for years.......and they dont boost 7-8 psi like us, on average 15-19psi.

random tech cats are awesome,
they are just pricey.

i'm getting a cat not to pass smog, but to look like i can.........although i'm pretty sure with magnaflow i will. plus it will reduce the stink factor.
whenever i need to pass smog i will just throw my stock DP on. takes 30 min.

flanges are expensive, but they shouldnt be $80, that's a rip off.
i payed 20 for mine.

i'm sure that in the shop u described, MS MSP, u are not only paying for parts but also for their knowledge and experience. i'm sure they will do an excellent job.......it's just do u really want to pay for it when there is stuff available already.
u go to shops like that for truely custom work, not to beat the price.