Horsepower HPI-51D1-17 Big Bore 51mm Throttle Body

Flow bench-tested and dyno-proven to deliver increased airflow, horsepower and torque. Fully machined and ported internally for unparalleled flow. Feature a stainless steel shaft and spring. Equipped with a sealed double roller bearing for smooth throttle operation. Brass throttle blade and shaft resist deflection which helps maintain throttle position accuracy. Completely replaces OEM throttle body and manifold; fully compatible with OEM components. Made in the USA.