If you buy a catback system, you'll increase the exhaust sound but the hp increase will be minimal. Most guys on this board seem to go with a Flowmaster or dynomax system. I'm personally going to get a X-pipe with hi-flo cats (Bassani X). I should be able to buy it in the next month or two. I would also tell you to get a K&N filter or look at some cold air induction systems. Some other mods to consider are 3.73 gears, pulleys, throttle body, mass air meter, and don't forget to brace your car. You can buy a strut tower brace and subframe connectors (weld-in). The gears and subframes are things that should be installed by a professional. All the other stuff you can handle depending on tools and how mechanically inclined you are.
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