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Old 11-27-2012, 03:21 PM   #87
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Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
2002 WRX - 750WHP
9.5s @ 150mph


Originally Posted by tank the ek View Post
Don't mean to wake up an older thread, but was the choice of the stock cat-back for the sake of noise, or was there another determining factor? Kind of curious if there could be anymore power pulled out of this with a larger/aftermarket catback, and how much.
Yes, it was simply to keep it quiet. I switched to the GReddy Ti-C exhaust (3.15" piping, N1 style muffler) and Virtual Dyno showed that it gained around 20WHP, but it was a little loud for me.

Since then I switched to the GReddy SP Elite (quad tip, much quieter) and the Invidia EL header. Recent logs still show me about 20-25WHP higher than when I dyno'd with the stock header and stock exhaust.

From what I've seen, the stock cat back is pretty decent, but at 400+ WHP it does start taking a little power away. Most all of the 3" options will do fine at that point. An N1 style can is going to be best, but it's not a huge difference.
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