GSC Power-Division S2 camshafts for the 08+ Subaru STi EJ257 with Dual AVCS. These cams are built to suite the higher horsepower Subys. With a power range of 500WHP 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. Intake 272 / 230 @ .040\" / Peak Lift 10.7MM / Centerline AVCS \n Exhaust 272 / 228 @ .040\" / Peak Lift 10.4MM / Centerline AVCS