I don't know if anyone has done this yet or even put it out there but I have a cheap exhaust modification I did myself and can be done at any exhaust shop if you take it there. It also sounds very nice. I was looking for the deep, low rumbly exhaust not the honda weedwacker sound and I've got it and didn't break my pocketbook either. You are all aware for the most part of the Cat's in the exhaust of the Suby. There is 3 I believe. Well, about the center of you car under the console there is a resonator that's about 1 1/2 ft long and about 8 inches wide that has chambers for the exhaust to go through. I and a buddy, both with '06's (he has the sti) cut that out and put a straight pipe in place of it. Then put a flowmaster muffler in place of the stock. What you get is practically a Catback exhaust but for only paying for the 40 series flowmaster muffler and the straight piping. Midas will do it for around 50 bucks for the cut and pipe weld and then it depends on where you go to get the muffler purchased and put on. Total for Midas (which is a little more expensive than others) was about 280.00 total. That includes the muffler, straight pipie, cut and welding. I also had them paint the muffler black for my car. I sure you can do the same for other colors. I did notice a slight gain in the car but I have no dyno to prove it sorry. I do know that it sounds nice for sure and I'm asked quite often where I got my exhaust done. Ok well, have fun and drive save guys/gals. Later
Aaron
I think you got screwed man you can get a 40 series on ebay for 47 bucks just go and look. ive got a few for past trucks ive owned, i now have a diesel so i run straight exhaust but anyhow. that resonator doesnt make a bit of diference in sound tho. so taking it out is basically a waste of time. I do all my own work so that part is just hte cost of gas for the mig. but most shops here charge maybe 10-15 bucks to install a muffler. and free if you buy it their. later.
Correct me if I'm wrong, but aren't the flowmaster mufflers designed to promote some back pressure since they are designed for muscle cars? I've never seen one on a turbo'd import. I'm going to look into that and report back.
Edit...
Yeah, look...
See the inside of that? For a boosted car, usually you can see right through the muffler. Although I'm sure it's fine... for the best performance you'd have been better off with something like a borla hush muffler if you want stealth or something from apex'i.
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Patrick - 2007 STi Limited
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Correct me if I'm wrong, but aren't the flowmaster mufflers designed to promote some back pressure since they are designed for muscle cars? I've never seen one on a turbo'd import. I'm going to look into that and report back.
Edit...
Yeah, look...
See the inside of that? For a boosted car, usually you can see right through the muffler. Although I'm sure it's fine... for the best performance you'd have been better off with something like a borla hush muffler if you want stealth or something from apex'i.
Just curious. When you say backpressure is not for turbo'd cars, how is it bad for it? Just want to know so I know if I'm going to be pulling it off lol. I guess someone's always got to be the guineepig sometime huh lol. I'm going to get it dyno'd here in a couple weeks anyways. I'll post the results.
Really I can't see the flowmaster as having much more backpressure than a stock cat so i wouldn't worry. It's not that it's BAD so to speak, it just hurts your top end performance and the rate at which the car reaches full boost. The whole point of doing an exhaust in a turbo car is to have as little restriction as possible behind the turbo.
I did some more research and apparently flowmaster use the 40 series muffler on their catback for the 2001-2002 WRX and it goes for about $300 or so.
Every car is going to need some amount of back pressure for the low end torque of the motor which is why you don't see muscle cars running around with open headers all the time. On a turbo car, the turbo actually provides that back pressure for the motor and anything after the turbo should ideally be as open as possible in order to allow the exhaust gas to flow through the turbo as quickly and smoothly as possible in order to help with speed in spooling and keeping full boost on the top end of the revs. I'm over simplifying but for the purposes of this thread I think that's an adequate explanation.
Don't yank the thing off... dyno it and if you don't like the results then research some catbacks and find one you like and then sell the flowmaster part on ebay or something. I'm sure it's fine though... it's just not optimum.
While it's on there... mind posting a sound clip?
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Patrick - 2007 STi Limited
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Is there a way to just do the sound?
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