Only cosmetic? I have only seen performance so far.
Drop down a few sections and you will see all you need for performance, Intake/Exhaust, Forced Induction, etc.
Some forum favorites so far:
~Stillen Gen 3 intakes or Injen intakes (Fitment is on your own with Stillen Gen 3 currently I believe)
~Stillen or Fast Intentions exhaust, maybe Berk if they every launch it (These for purely for gains, but do sound great)
~HFC - stillen/berk/F.I./etc. or if you want you can jump on the first Long tube header by Fast Intentions
~Forced induction - Twin turbos by a few places and currently a couple of supercharger kits are being worked on, no ETA on either launch though currently.
Beyond those there is not much currently, you have some pulley upgrades, weight reduction work, and a few other options in terms of power.
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