Long tube headers are your bets bet for decent gains after having all the other bolt-ons. It's pricey though with install so it comes down to how much you are willing to pay for it. Only other things would be pulleys (but it won't be a hp diff you can feel) and cams which are just as bad or even a worse HP ROI than headers. But it comes down to what those extra whp are worth to you and that varies from person to person.
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Works Emotion CR Ultimate - FI CBE w/ 18" resonators - Ecutek - eibach sways - Quaife - FI LTH w/race cats - kw v3 - spl - Topgunz SC - 488whp 398trq
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