It's a rabbit hole I don't know if you want to go down. It gets pricey. After a cai, test pipes or LTH's ($), cat back, tune. That's where you pick up the most bang for your buck. After that, the prices increase greatly for little hp increase. When you have done the before mention add-ons. Next would be throttle bodies, port matching the intakes, cams. Do all of this. You're about 1/2 the price of a Stage 1 TT kit that will almost double the hp.
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