Arlen Ness 18-459 Big Sucker™ Air Cleaner for 2017-2023 FLT, Factory Cover
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
California Air Resource Board: Executive Order D-639-12_R-01
California Prop 65: Learn MorePatent-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
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
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
