Arlen Ness Stage I Big Sucker Air Filter Kits for 1999-17 Harley Twin Cam - No Cover - 18-507 MPN_79-1101 2004 Harley-Davidson Softail Fat Boy

2004 Harley-Davidson Softail Fat Boy - FLSTFI

2012-16 KTM 300EXC

2000-03 KTM 250 EXC

2000 Yamaha YFM80

Part Number: W4894

Arlen Ness Stage I Big Sucker Air Filter Kits for 1999-17 Harley Twin Cam - No Cover - 18-507 MPN_79-1101 2004 Harley-Davidson Softail Fat BoyArlen Ness Stage I Big Sucker Air Filter Kit Engineered and proven to give your engine maximum airflow for more horsepower & torque The Big Sucker kits are designed to be used with the stock outer air filter cover or an Arlen Ness custom outer cover One piece aluminum backing plate features patented hidden breather technology Each hidden breather is O ringed at the heads and exits at the mouth of the injector carb to provide efficient engine