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I think the best thing you can do is add an aftermarket y-pipe. You will free up power and get better mpg.
Honestly, there are only a handful of bolt on things you can do (y-pipe, UDP, exhaust, NWP spacer), then you need to really start moving up the ladder (nitrous, turbo).
Upgrading suspension is one of my favorite mods. Even if you car isn't faster in a straight line, it can handle corners a lot better.
I did the 9007 headlight conversion and I am very happy with the light output.
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