The exhaust alone doesn't appear to make a big noticeable improvement on performance. Probably more noticeable when coupled with an good air intake system, better downpipe, and cat. I know it doesn't help you much regarding what brand to get, since most of everyone will direct you to what they have on their car. Also, nobody really has dyno'd their car running various types of exhaust, with various type of free flowing cats, with various types of downpipes, etc. So the best judgement would be from you. Whatever fits your wallet, the looks, and sounds, etc.
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<b>\'04 PT GT Graphite Metalic w/Autostick: </b> Stage1, BTG Strut Tower Brace, Eibach Anti-Sway Bars, Airaid CAI, Mopar 2.5\" Dual Cat-Back (D: 14.48@93 - A/S: 14.56@90) <i>...more mods at CarDomain or PTCruiserWorld</i>
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