considering its just a cat-back.... 5 at the very most.
If you're looking for more power there's better ways to spend 600 bucks like get come more aggressive cams.
ADD: Any exhaust system that you get will only free up lost horsepower in your stock system. I.e. making it a smoother flow as opposed to going over axles, around suspensions and so on.
As for the cams.... you'd have to run a thorough check on them. I know they make them for the GT-S I dunno about your car.
If you want to get power through your exhaust system go to an exhaust shop and ask them how much would it cost to custom build you a header-back exhaust. Buy yourself some performance headers offline (they cost from 100-250), and coupled with the straight header back exhaust (maybe a 2 1/4 ") that should get you around 15-20 hp and save you a lot of money as opposed to getting a brand name cat-back.
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How much more horse power would i get with this exhaust?
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