Dyno-designed AirLoad backing plate reduces turbulence and increases air intake velocity, boosting horsepower and torque Custom-made K&N« air filter provides increased airflow volume to the engine Complete hardware kit and instructions included for easy installation Round center-bolt design retains the stock round air cleaner cover Exposes more of the engine and brings out its aggressive nature Machined from 6061-T6 billet aluminum New low-profile black air filter element Made in the U.S.A.. AIR CLNR M8 SUPAIR ST