bang for the buck i would get N2O (NX kits seem to be the best out there right now). but, you may want to get an intake (cold air has the best HP increase EX. AEM's) and exhaust set up first so your car can breath easier. Do not go over 2 1/2 in piping, that will slow you down unless you plan on getting FI in the future. Bigger is not always better with an NA car.
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