GSC Power-Division Billet S2 Camshafts for the 2008-21 Subaru STI EJ257 with Dual AVCS are built to suit the higher horsepower engine builds. With a power range of 500 WHP and up, you need some certain mods to utilize the true potential of the S2s: built motor, with a built/ported head, and a good engine management system. Upgraded valve springs are required; beehive valve springs are recommended but not required, sold in sets of 4.
Stage 2 Street Strip kit offers short duration for nice street manners, with a slight lope at idle. Excellent all purpose spec. OEM valve springs are okay. 272°/272° duration.
Fits all EJ25 Dual AVCS cars, including 2008-2021 STI.
