High flow design billet aluminum construction. 4" opening with internal taper down to 62 mm ID. Fits M-Eight throttle body three hole bolt pattern. Impressive horsepower and torque gains on engines running modified and ported cylinder heads and intakes with larger throttle bodies. Great performance part for racing and for those that want to head to the track on the weekend. Includes the aluminum backing plate and needed hardware for standard head breathers. Made in the U.S.A.