HOTCAMS Camshaft - Stage 2 Exhaust. Stage 2 exhaust. Added top end over Stage 1. An incredible way to boost the midrange and top-end horsepower. Increases over-rev on motorcycles and ATVs. Easy to install with minimal valve adjustment and re-jetting requirements. The camshaft uses such precise engineering and build quality that they are consistently voted top product of the year. Note: Intake and exhaust cams sold separately.