definitly go for the aftermarket. id look at blitz nur spec, or hks, or greddy. all of these can give you more hp gains, nicer sounds, less restrictive, and cheaper than the one offered by subaru. its b/c the one offered by subaru doesnt void the warrenty. not worth it if you ask me
I have the HKS carb/tit exhaust and it makes my car sound like a V-8. I like it, but then again it's a matter of taste. If you'd like to hear how it sounds go here and click the 2002 Subaru WRX link. Go all the way to the bottom of the page, and you'll see three sound clips. The clips them selves are okay, but they'll give you an idea of how it sounds.
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