ARLEN NESS Stage-1 Air Filter - EFI '99-'01 18-498

If you're running EFI on a '99-'01 Harley, you know that stock breather setups compromise both aesthetics and airflow. The ARLEN NESS Stage-1 Air Filter eliminates parasitic losses by creating a virtually closed-loop system—breather passages exit directly at the throttle body mouth, which means cleaner air intake, better engine breathing, and a cleaner engine bay. You get all of this without the clutter of banjo fittings, hoses, and external filters.

This is a true bolt-on upgrade that pairs precision engineering with real-world functionality. The one-piece aluminum backing plate doubles as a carb support bracket, so installation is straightforward and the finished look is clean. Whether you're tuning for peak performance or simply want to shed unnecessary hardware, this filter system delivers on both fronts.

• High-flow filter element
• One-piece aluminum construction
• Closed-loop breather design
• No external hoses required
• Accepts OEM covers (round/oval)
• Includes all hardware
• Bolt-on installation
• EFI '99-'01 specific
• MPN: 18-498