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alright right now i have a custom exhaust on my car. i hate it to be honest..i want it to be quiet, which mine is, but mine also sounds horrible. my question is does anyone have any dyno proven gains from replacing the exhaust, the axelback more importantly. i want to run a 3in mid pipe to the axelback much like the turbo xs stealthback on the previous gen wrx's. i know the bottleneck effect is there but its a sacrafice i am willing to make.
 

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E-mail Perrin. They did these runs but didn't post the results on their site. If I remember correctly it was about a 3-5whp difference.
 
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