Fits 1988+ XL Sportster models

Big Sucker™ Stage 1 air cleaners are engineered and proven to give your engine maximum airflow for more horsepower & torque. The patented hidden breather backing plate 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

Knuckle Stage 1 Air Cleaner Cover

Increases Horsepower & Torque

Patented Hidden Breather Technology

Pre-Oiled & Synthetic High Performance Filters

One-Piece Aluminum Backing Plate

Radius Air Inlet for Unobstructed Airflow