DescriptionGSC Power-Division Billet Evolution 4-8 S1 CamshaftsThe GSC Power-Division billet S1 cams for the Mitsubishi Evo 4-8 are designed for those with the stock turbo up to the 550 WHP stock location or aftermarket turbo kits. These cams will not sacrifice any bottom end loss over stock cams; nothing but gains, and will promote faster spooling of the upgraded turbos.