STi cat-back - Subaru WRX Forum
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post #1 of 2 Old 03-02-2003, 10:52 AM Thread Starter
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Thumbs up STi cat-back

I put the sti cat-back exhaust on my wrx and have noticed a little performance enhancment along with a great sound that is not too loud and anoying like ricers in their civics but does anyone know a claimed HP increase by fitting it to a stock wrx. I also added a K&N air filter.
Any info on these seperate or together is apreciated.
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post #2 of 2 Old 03-16-2003, 07:11 PM
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I believe its suppose to be around 7-10 h/p.
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