Drivetrain New Arqray Ti Exhaust :)
I'd say 5-10 HP which would equate to 3-8 WHP. Not sure an exhaust would make a noticeable "seat of your pants" difference.
However, if you're just putting on just an exhaust, sound would be more important to me than performance.
Mark
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So around how much gain would you get in a typical exhaust system? 