Big Sucker Stage-1 - Natural - M8

One-Piece aluminum backing plate with hidden breather technology Each hidden breather is O-ringed at the heads and exits inside the mouth of the throttle body for a virtually closed loop system, eliminating the need for any external hoses or hardware Radius air inlet provides maximum performance by providing unobstructed airflow All necessary hardware and instructions are included Pre-Oiled high performance filter is washable and reusable Performance filter is made from 4 layers of surgical grade cotton Increases horsepower and torque Performance filter is handmade in the USA