Use the search function, or look at stickies in the appropriate forums. The most common mods are the Intake, Exhaust, And header, commonly reffered to as I/H/E. You can also do pulleys, short shifter, TIRES .. good tires is an excellent mod, althought it wont give you more HP, it will help. a Zex kit (n20) is an easy way to get HP.
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