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Old 12-06-2012, 01:00 PM   #17
Scooby Newbie
Member#: 66206
Join Date: Jul 2004
2005 WRX STi


Originally Posted by twinturbomeow View Post
would'nt a sti axleback create a bottle neck considering he's going from3" piping to 2.5?
I've got a much larger than stock turbo fitted on my car and the stock axleback costs me 5 - 10 whp tops. I gain around 15whp with a full cutout.

You are giving up some horsepower, but it isn't very much for the amount of sound the stock axleback is able to suppress. Obviously, if you want every last horsepower you'll want larger piping but it certainly won't be as quiet
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