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http://www.tfproject.org/tfp/showth...=exhaust+thread Heres the exhaust thread.... the thing i have a problem with username is that u said it gives u all the flow u needed (im assuming u say its = to a full 3" back). The exhaust thread would disprove that. Not hating, just showing the thread.
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That is fine, I'm just saying what Cobb generally seems to recommend and what most other people who have WRXs have done. Besides, I gave up on the whole modding thing on Monday and just bought an M5.
Edit: Actually, I read the exhaust thread and it stated
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For engines making 250 to 350 horsepower, the generally accepted pipe diameter is 3 to 3 ½ inches
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So a 3" turbo back should be fine since most modded WRXs are gonna be between 227 hp stock to 320ish for a vf34 modded WRX.