Arlen Ness 18-457

The Big Sucker™ performance air cleaner for Milwaukee-Eight® (M8) 2017-2023 FLT Touring / Bagger models is specially designed to pull in the most air possible under the factory air cleaner cover. The backing plate features a new patent-pending hidden breather system and a formed aluminum internal design resulting in more performance with no oil blow-bye issues. The newly integrated patent-pending oil catch makes sure no oil ever touches the massive perimeter-flow air filter.  

• Increases Horsepower & Torque 
• Eliminates Oil Blow-bye Issues Associated with M8 Engines
• Red Pre-Oiled High Performance Filter 
• Patented Oil Catch / Reservoir 
• Patented Hidden Breather Backing Plate 
• Aluminum Filter Top Plate Design Eliminates Internal Mounting Hardware  
• Specially Formed Radius Air Inlet & Air Venturi 
• Fitment: 2017-2024 Touring (except '23-later FLHXSE, FLTRXSE, '24-later FLHX and FLTRX) and Trike models

Patent-Pending Backing Plate:

• Aluminum  
• Patent-pending hidden breather technology is an enhanced version of our our original patented system. Each breather is o-ringed at the heads, passes through the backing plate and exits inside the mouth of the throttle body through specially formed breather tubes
• Eliminates oil blow-bye  issues associated with performance intakes on M8 engines 
• Patent-pending oil catch is integrated into the backing plate and acts as a reservoir by stopping any excess breather oil from ever reaching the air filter. Serviceable design, simply bolt-on and off to wash  
• Formed radius air inlet engineered to provide unobstructed airflow 
• Outer filter lip matches up with the factory air cleaner perfectly and covers the urethane on the base of the air filter for a clean look

Performance Air Filter:

• Made from red pre-oiled cotton 
• Engineered for optimum air flow and filtration. Perimeter flow design brings in air from all sides of the filter while filtering out all harmful debris 
• Massive size, over 200% more filter surface area than the factory air filter. Features pleated material around the entire perimeter of the filter 
• Washable and re-useable, filter service kits are available 

Filter Top Plate:

• Aluminum  
• Specially formed to secure the air filter and mount directly to the backing plate
• The design eliminates any internal mounting hardware for increased durability 
• Integrated air venturi directs air into the throttle body 

Backing Plate Assembly: 18-393C Chrome / 18-394B Black

• Aluminum Backing Plate, Black
• Aluminum Filter Top Plate
• Filter Top Plate Hardware, Stainless Socket Heads ¼ - 20 x 1-1/2” (2)

Patented Breather Vent System Components: Shooter Tubes & Oil Catch

• Oil Catch: 18-392-3
• Oil Catch Gasket: 18-392-4
• Oil Catch Hardware, Stainless Socket Heads 8-32 x ¾: H-619S (2)
• Shooter / Breather Tube Kit: BT-001

Stage 1 Hardware Kit, M8: HK-18458

• Breather Bolts, Chrome: 18-457-4C (2)
• Throttle Body Gasket: 18-457-3
• Breather Bolt O-Rings: H-024-4 (4)

Logo Plate / Throttle Body Badge Assembly

• Throttle Body Logo Badge: 18-203-8
• Throttle Body Badge, Black Button Heads M6 x 1.0: HM-122B (2)

Additional Components:

• Outer Cover Hardware, Chrome Flat Head 5/16-18 x 5/8: H-525C
• Instruction Sheet: 18392-I

Harley-Davidson® 

’17-later Touring (except '23-later FLHXSE, FLTRXSE, '24-later FLHX and FLTRX) and Trike models. Not compatible with air cleaner cover on CVO^™ Touring models

FITMENT DISCLAIMER

Fitment information is provided as a general reference only and is not guaranteed for any motorcycle, whether stock or modified. Compatibility may vary by year, model, and individual configuration.

Customers are responsible for verifying fitment prior to purchase. House of Harley-Davidson assumes no liability for purchases made based on incorrect or unverified fitment information.

Please contact our Parts Department with any questions before ordering at 414-282-2211