Arlen Ness 600-303

The new Big Sucker™ Stage 1 performance intake for 2024 Touring / Bagger models features an all-new design that is engineered & tested to enhance performance in all riding scenarios. Each backing plate features a radius design from the outer edge of the backing plate to the mouth of the throttle body, resulting in more airflow. This kit includes a Smooth Stage 1 custom outer cover for a clean custom look

• Features our Smooth Stage 1 custom cover
• All-New next generation backing plate design  
• Increases Horsepower & Torque
• Black Pre-Oiled High Performance Filter 
• Patent Pending aluminum backing plate that features zero flat surfaces, every angle of the intake is designed to promote airflow 
• One-Piece Aluminum top filter place with integrated air venturi to direct airflow into the throttle body 
• Finish: Black 
• Fitment: '24-Later FLHX / FLTRX / FLTRXSTSE & '23-Later FLHXSE / FLTRXSE Touring models / 2025 Softail Models 

Aluminum Backing Plate: 

• Aluminum backing plate  
• Next generation design engineered for increased horsepower & torque 
• All-new aluminum filter ring design covers all mounting bolts & urethane bottom of the performance filter for an ultra clean look 
• Single piece aluminum top filter plate features an integrated air venturi to direct airflow to the throttle body  
• Radius air inlet engineered to provide maximum airflow 

Performance Air Filter:

• Made from black pre-oiled cotton 
• Engineered & tested for optimum air flow without sacrificing filtration
• Perimeter flow design brings in air from all sides of the filter while filtering out all harmful debris 
• Washable and re-useable, filter service kits are available 

Air Cleaner Cover:

• Arlen Ness® Stage 1 Smooth Custom Cover
• Black Finish 

Backing Plate Assembly: 

• Aluminum Backing Plate: 600-300-1B
• Aluminum Filter Ring, Black: 600-300-2B 
• Intake Ring: 600-300-4

Performance Air Filter: 

• Performance Air Filter: 50-090
• Air Filter Aluminum Top Plate w/ Air Venturi: 600-300-2R

Hardware Kit: Hardware & Gaskets 

• Backing Plate Mounting Bolts, Socket Head 3/8-16 x 1.5" (2): 600-300-6 
• Throttle Body Mounting Bolts, Custom Socket Head 1/4-20 x .75 (3): 600-300-5
• Throttle Body Gasket: 600-300-10
• Filter Ring Gasket: 600-300-3
• Filter Ring Mounting Bolts, Flat Head 10-24 x .5 (6): 600-300-7 
• Filter Top Plate Hardware, Socket Heads ¼ - 20 x 2.25 (2): 600-300-9
• Breather Hose Fitting, Black: 600-300-8

 Air Cleaner Outer Cover: 

• Smooth Stage 1, Black 

Touring Models

2026 FLHXLSE CVO Street Glide Limited

2026 FLHXL Street Glide Limited

2026 FLTRXL Road Glide Limited

2026 FLHXSTSE CVO Street Glide ST

2026 FLTRXP Police Road Glide

2024-2026 FLHX Street Glide

2024-2026 FLTRX Road Glide

2023-2026 FLHXSE CVO Street Glide

2024-2026 FLTRXSTSE CVO Road Glide ST

2025 FLHXU Street Glide Ultra

2023-2025 FLTRXSE CVO Road Glide

SOFTAILS Models

2025-2026 FXLRS Low Rider S

2025-2026 FXLRST Low Rider ST

2025-2026 FLFB Fat Boy

2025 FLSTFI Fat Boy Gray Ghost

2025-2026 FLHC Heritage Classic

2025-2026 FXBB Street Bob

2025-2026 FXBR Breakout

TRIKES

2026 FLHLTSE CVO Steet Glide 3 Limited

2026 FLTRT Road Glide 3

2026 FLHLT Steet Glide 3 Limited

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