Over 10 years of product development and race winning results still makes this the ultimate bolt on upgrade for your YFZ450R. Improving throttle response and power throughout the power curve this throttle body upgrade is perfect for any racer or enthusiast looking to improve performance from their Yamaha YFZ450R. Complete with a race map designed by PEP Performance Tuning, this throttle body also comes with a new throttle cable for twist or thumb throttle and new modified manifold.