Bypass exhuast with electronic valve

[hand14me]

Hey guys - i may get flammed for this one but im very interested. I have heard some people make a Y pipe in the exhaust right after the cat, one end goes to stock muffler and one end just opens to mother nature. There an electronic valve on this side that is controlled from the cockpit. Ex. you want to race or just open her up - you flip the switch inside, and go for it. Loud as hell sound b'c not muffled, but also no back pressure. Illegal yes, put what the hey. Let me know if anyone knows what i am talking about and/or has had any luck.

Thanks

[t3ase]

You won't get flamed for it.. I won't put up with that here anymore..

Anyway, I had been running open exhaust for quite a while before the clutch went out. Yeah, it was loud and I felt all riced out when driving in to the car meets.. However, it opened up the top end quite a bit. Keep in mind that most drag strips will NOT let you run open exhaust but for your light to light racing or highway drivng, it'd help out.

[TX Speed Demon]

I've heard of this too. Alot of the cars in sport Compact Car's last street car challenge had this done to pull high numbers on the dyno and low emmisions on the smog test. Sounds like a good but expensive idea to me.

[hand14me]

The most expensive part would be the valve i think - I don't even know where to start looking on that, and then just welding the piece at a muffler shop

[t3ase]

Actually, I saw one at summitracing or some place like that.. Wasn't too terribly pricey at al..

[Black Majik MSP]

A friend of a friend has this done to his RSX-S. It's most likely a custom job, so it's hard to get a price on it, but it's a very cool idea. My muffler is actually the one he used to have on his car, but he changed to this setup because he was getting complaints & tickets for it in his neighborhood.

This is him: http://www.cardomain.com/id/dc5_rsx

[t3ase]

It's call an "exhaust cut-out", I believe. I'll see if I can find one for ya later on.

[ARunto]

summit sells them

[Maniac0301]

Yeah they are usually labeled as an exhaust cut out or exhaust diverter. In general you can get the complete setup for around $150.00 no more than $200. Don't run it wide open for very long because having exhaust gases exit directly below your feet isnt the greatest thing not to mention that area by the tunnel will get very hot very quickly if your at a stop light. Other than that I might go with one though the SCCA will have a cow even if I keep it shut.

[DiscreetSpeed]

its better than a catback imo!...i recommend it.....and it does not sound ricey

[PaulMP3]

get a downpipe to remove your first cat.. then put the cut out... open exhaust when wanted.. best HP per $ out of exhaust work.

[ThrillRide]

it is not expensive at all. i am having it done. but i am doing it before the cat. it will do you NO good after the cat. the muffler is not that restrictive. i am doing mine beore the cat and doing o2 simulator so i dont thro a code. and it will give the same results if not better than an aftermarket turbo back. but if you do it after the cat you really are helping anything.

[t3ase]

Gotta disagree. Like I said, I've been running open after the cat and there's a nice difference up top.

[ThrillRide]

your alowed, however it would work better before the cat as they are the source of most of your restriction. the muffler is not.

[t3ase]

I agree it would help out more but it's not right to say opening it up after won't cause a noticable change, because it will.

[DiscreetSpeed]

I agree it would help out more but it's not right to say opening it up after won't cause a noticable change, because it will.
very true but what will give the best gain, i wouldnt know though i have the apex Dp and the flowtech after it...........straight thru performance. (lol2)

[Striker187]

if you're looking to buy one, www.quicktimeperformance.com sells a popular version. they're around $150.

[hand14me]

it is not expensive at all. i am having it done. but i am doing it before the cat. it will do you NO good after the cat. the muffler is not that restrictive. i am doing mine beore the cat and doing o2 simulator so i dont thro a code. and it will give the same results if not better than an aftermarket turbo back. but if you do it after the cat you really are helping anything.

Well let me know how it goes and exactly what you did and such - are you going with the electric cut out. I am very excited about this - i just need to learn alot more before i even think of doing something.

[ThrillRide]

well the electric open/close is more expensive. I am jsut having a removable dump put on. Should be done in a couple of weeks. I'll post about everything when it is complete.

[jred321]

you're all stealing my plan! j/k

i'm going to do an electric cutout directly below the cast section before the first cat, as long as all fits. the straight down path will be where the cutout is so when it's open the only restriction will be the s pipe, and then i can be bone stock behind that if i want and not worry. i won't have it done until after i get back from australia in mid may though.

[ThrillRide]

sorry to steal. actually i have been wanting to do this since i got this car. i am just now $$ able :) well i just talked to a guy at quicktime which striker recomended. he is excited about making one for our car specificly. i am searching for clearance pics. if anyone has some please post. i too am wanting to do the direct down path. He also suggested this way. So I will keep in contact with him and maybe we can come up with something. This would be a far cheaper method than doing a full turbo back. he says he has specific one for the subaru and the VW's. he said there is no better method of exaust. so post pics please and i will get something going. he is also talking about a protege specific downpipe if there is enough interest.

edit: i remember seeing some pics of a down pipe instal pic. that would be good and any general clearance pics. also stock and aftermarket downpipe pics would be great.

[jred321]

http://www.mazdamp3.com/vbb230/_handler.php/vodapas77/11-23meet%20(32).jpg
http://www.mazdamp3.com/vbb230/_handler.php/vodapas77/11-23meet%20(34).jpg
these are the best i could find. apparently most people think the most important part of an exhaust is the muffler, so there are tons of those pictures, few underbody shots though

[ThrillRide]

lol...very true.

Thanks for the pics. I'll get them over to QTP today and see what he says.

[ThrillRide]

thats not the stock DP is it? which one is that?

[Equinox]

Yeah it doesn't sound ricey, just like a friggin 350 chevy with flow masters.

[jred321]

thats not the stock DP is it? which one is that?
it's an apex downpipe, from vodapas77's car. it should give a good idea of the area at least though

[ThrillRide]

yeah it helps. in your case all you would have to do is buy the product and cut and place basicly. i think the stock dp is cast. thats is what it looks like but i need to just get under mine and find out. if the stock is cast then that piece of the dp from turbo to cat would need to be replaced. which should not be very difficult. i am going to be the guinie pig for this product i guess. i really think it will work fine using the quicktime performance product.

jred are you using the mil form apex? my only question is if i am using the stock setup and have the mil will it function properly when the dump is closed. everything should be fine while its open i just dont know how it will react when closed for daily driving. i am guessing the mil works regrardless of the set up. i dunno. i will just have to play a bit. i am ordering the product today. i'll let you all know what happens. feel free to give input if anyone has some.

[jred321]

that's not my exhaust, im stock ;)

the cast section i believe is just above where this dp starts. you can see one of the bolts in the first pic. here is a stock dp but not on the car
http://www.msprotege.com/vbb300/attachment.php?attachmentid=5893
what i was thinking was basically a replacement pipe for that first section up to the flange before the first cat. there would just be a small piece that goes straight down where that first bend is, and the dump would be there. then if you want to go back to stock, it's just a matter of 5 bolts. if a company wants to make that piece for me so i don't have to go get it made i might buy it, but it's not exactly a complicated piece so i could have one made cheap.
as far as the mil goes, i would say you wouldn't need one. your car has to see the lack of cat for a while to throw a code, and the point of a cutout is to be stock most of the time, so when you open it for a little while it won't throw a code. some gas should still make it through the cat though, especially if it is partially opened, so there shouldn't be a problem. hopefully.

[DiscreetSpeed]

Yeah it doesn't sound ricey, just like a friggin 350 chevy with flow masters.
what are you talking about..youve never even heard one on a msp. (bicker)

[ThrillRide]

that is what he suggested...just have one made. it is a short section and would be easy to have made. he said he would not fab a piece to sell unless there was a lot of interest. which there wouldn't be enough because there are not that many MSP's to begin with. but he said is should work fine. he really is not sure of the outcome with it being that close to the turbo. however i am going to try it with their dump. it is an electronic switch you can open or close any time from the cockpit. you can make one cheaper if you want to open and close it by hand, which is what i was going to do originally. but i like the way this one looks.

[Equinox]

what are you talking about..youve never even heard one on a msp. (bicker)


you're kidding me right?

Not only did I drive around with the exhaust dumped, for a while, but I heard your car running the dyno, with your dump pipe open

[DiscreetSpeed]

you're kidding me right?

uhm yeah i was........ (spank)

[spacemonkey]

Thrillride...Im interested. How reliable is this electronic gate? I dont want it to crap out on me and be stuck driving throught my neighborhood at 3am with open headers.

[Striker187]

email quicktime...i'm sure they offer some kind of warranty for this thing.

[ThrillRide]

it has a 90 day warranty. if you don't want to worry about an electric one you can always buy a manual one.

[ThrillRide]

well i just came back from visiting with my exhaust guy. doesn't look like i will be able to use the electric cut out from quick time perf. there will be clearance issues and heat issues. i am still going to try a cut out of some sort. he said he could make me a down pipe with flange for 150 which is pretty damn good. so i might consider that as well. because he said there would be no point in putting the cut out after the cat. he said we have a straight threw muffler, so it would be a waist of money to do a cut out after the cat.

on a side note while he had the car up on the lift i noticed a samll 90 degree piece which bolts from the frame to the downpipe is cracked all to hell. barly holding. probably due to the wheel hop from the crappy motor mounts. you all might want to get under and have a look at yours.