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Well there are a few exhaust on the market that provide actual hp gains, but its not much. The main thing you want to look for is weight reduction. The stock cat back design is actually very efficient, however it weighs around 65 lbs. That is why most cat back or header back systems only add a couple hp, but if you go with a titanium system (like the amuse, only like 9 lbs) the weight reduction is well worth it. But with that system it is VERY loud. I have the apex n1 catback which i really like, it weighs about 22 lbs, looks nice, and was affordable. Spugen makes really affordable titanium exhausts though if thats what you are looking for, i think they run around $600. But most with noticable gains are going to be louder than your stock exhaust. Good luck with your decision.
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