Twin Air 160731 Powerflow Throttle Body Kit for Suzuki RMZ450 08-14Get faster, smoother throttle response where you need it most. Installed in your throttle bodys Venturi tube, the precision engineered sleeve reduces the diameter and accelerates the velocity of your air fuel mix. Add the thinner butterfly valve and less obstructive shaft, and youve got faster, more even throttle response through low and mid range. For better top end throttle response (90 100% open throttle position), use the kits larger butterfly