basics first, that is intake, exhaust, headers, ECU, pulley(hey wadd we got any info on this?) then you move onto weight reduction, rims, tread, suspension. lastly you move into internal work, choosing either NA or FI.

so far you options are limited tho, intakes are on their way, and exhausts are out, with more coming.

you wont find real huge gains with the initial parts, maybe 5hp from them for a good chunk of cash, but you have to crawl before you can run.