turboxs 4" downpipe?? - Page 2 - Subaru WRX Forum
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#16 Old 12-09-2008, 10:25 AM
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Mosc is pretty much right. I know a guy running the APS 3.5" catless on a VF22 on his 06/07 STI. It's too big even for the largest IHI turbo. Another guy I know is running a 3.25" catless, don't remember what brand, on his 06 WRX with a VF34. It was perfect for the car, it ran 11.8 at the track. I'm running a 4" to 3" ERZ catless bellmouth on a VF34 on my 03 WRX. I'm running mid to low 12s.

Unless you are over 500hp, you don't need anything larger than a 3.25" on the 2.5L and 3" on the 2.0L. Well on the 2.0L, the block really isn't reliable after 400hp.

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#17 Old 12-09-2008, 02:52 PM
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I run a 3" downpipe, a cat, and a 2.5" exhaust. I hit 276whp on a mustang dyno just fine. In fact, I'm intercooler limited not exhaust. I can probably get 325-350whp with my exhaust.

You guys with 2.0L and small turbos are nuts to think you need MORE exhaust than that.

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#18 Old 12-09-2008, 03:34 PM
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Quote:
Originally Posted by mosc View Post
I run a 3" downpipe, a cat, and a 2.5" exhaust. I hit 276whp on a mustang dyno just fine. In fact, I'm intercooler limited not exhaust. I can probably get 325-350whp with my exhaust.

You guys with 2.0L and small turbos are nuts to think you need MORE exhaust than that.
Yeah, right now fuel is my only limitation. I'm running the VF34 on 565cc Pinks with a Walbro. Thinking about larger injectors so I can push the car a little more. That's assuming I don't blow it up before then...

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