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Old 11-26-2001, 11:56 AM   #6
Scooby Guru
Member#: 1594
Join Date: Jun 2000
Chapter/Region: MWSOC
Location: Carson, IA
1999 2.5 RS
2002 Legacy


What kind of HP increase can you expect from the STi muffler? I have a WRX.
Free flowing and larger exhaust does more on a turbo car than a N/A car. I have no idea the power gains for your WRX from just the pricey STi exhaust (back box only). This is however the N/A powertrain forum so I suggest you post in the Factory Turbo forum to receive better answers as that is where the question belongs.
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