Hot Cam Ttr125 4019-1Camshaft Stage 1Designed and dyno proven in the USA Engineered by using valvetrain software Adds a 5% 10% power gain CNC machined from 8620 billet, case hardened steel for an exact fit and lobe profile Select cams feature Hot Cams Improved Throttle Design (I. T. R.) technology; these cams improve throttle response throughout the entire rpm range while providing excellent power gains through the mid range and top end Designed for low end torque.