Stage 2 is designed for mid to top end gains Adds a 5%-10% power gain Designed and dyno proven in the USA Manufactured by utilizing state of the art valvetrain software CNC machined from 8620 billet, case-hardened steel for an exact fit and lobe profile Engineered to be drop-in cams, that use stock valve springs (unless otherwise noted). 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 dual cam engine.