GSC Power-Division Billet S2 Camshaft set for Subaru EJ255/7 with Intake AVCSThe addition of GSC Power Division's billet S2 camshaft set gives Subaru enthusiasts the ability to increase the potential of their built EJ255 and EJ257. With a higher duration and extended lift, these cams allow more air and fuel into the cylinders to support larger turbos and other upgraded components. These cams are best used in conjunction with a built block, built and ported head, and a turbo capable of supporting 500 horsepower or higher.