Camshaft - Intake - Stage 2 - Yamaha Adds 5%-10% power gain, Designed and dyno proven in the USA, Engineered by utilizing state-of-the-art valvetrain software, CNC machined from 8620 billet, case hardened steel for an exact fit and lobe profile, Select cams feature Hot Cams Improved Throttle Design (ITR) technology; these cams improve throttle response throughout the entire rpm range while providing excellent power gains through the mid-range and top-end, For mid to top-end gains., Made to be drop-in cams that use stock valve springs (unless noted).