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Biggest improvement by far for me was when I installed headers.
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2013 Lightning Red - 6MT Perrin Inlet Hose ~ TRD Panel Air Filter ~ OEM Modified Snorkel ~ Revolution 4-2-1 EL Header ~ HKS Resonated Front Pipe ~ BRZedit self tune ~ KW Clubsport Coilovers ~ AP Racing Big Brake 4 Piston ~ Whiteline Front Endlinks ~ Perrin Rear Endlinks ~ WedsSport TC105N 17x8 42+ ~Dunlop Direzza II Star Spec 225/45/17 ~ STI Trunk Lid Spoiler |