K&N Air Filter For Harley Twin Cam 1999-2015

K&N High-Flow Performance Air Filter for Harley-Davidson Twin Cam (1999–2015)

Unlock your engine’s hidden potential with the K&N High-Flow Air Filter, the gold standard for Harley-Davidson performance tuning. This precision-engineered intake element is specifically designed for 1999–2015 Twin Cam models, providing a massive boost in airflow volume compared to restrictive factory paper filters. By optimizing the air-to-fuel ratio, K&N helps your 88ci, 96ci, or 103ci engine deliver smoother acceleration, sharper throttle response, and measurable horsepower and torque increases across the entire RPM range.

Proven Cotton Gauze Filtration Technology

At the heart of every K&N air filter is four layers of surgical-grade oiled cotton gauze media. Unlike standard filters that trap dirt on the surface and quickly clog, K&N’s deep-pleated design utilizes a “depth filtration” method. This allows the filter to trap microscopic particles while maintaining low-restriction airflow, even as it accumulates road grime. This is the ideal Stage 1 intake upgrade for riders who want high-output performance without compromising engine longevity or protection.

Washable, Reusable & Eco-Friendly

Stop wasting money on disposable filters. The K&N replacement air filter is a “lifetime” product that is completely washable and reusable. Under normal street conditions, this filter can go up to 50,000 miles before requiring its first cleaning (using a K&N Recharger kit). This sustainability makes it a smart investment for Harley-Davidson maintenance, as it is designed to last the entire life of your motorcycle. Every filter is backed by K&N’s famous Million-Mile Limited Warranty for total peace of mind.

Direct OEM Fitment – Replaces Part #29461-99

This high-flow intake element is a direct replacement for Harley OEM part number 29461-99 (and 29400042). It is designed to be a “drop-in” fit for the stock oval “football” style air cleaner housing found on:

• Harley Touring (1999–2007): Road King, Street Glide, Electra Glide, and Ultra Classic.
• Harley Softail (2000–2015): Fat Boy, Heritage Classic, Deluxe, Slim, and Breakout.
• Harley Dyna (1999–2017): Street Bob, Low Rider, Super Glide, and Wide Glide (select models).
• Note: Not compatible with Screamin’ Eagle or aftermarket “Big Sucker” backing plates.

Maximize Your Stage 1 Performance

To truly feel the V-Twin power gains, we recommend pairing the K&N High-Flow Air Filter with a high-performance exhaust system and a fuel management tuner like the Vance & Hines FP4. By increasing the oxygen intake, your EFI system or carburetor can optimize combustion, resulting in a cooler-running engine and more aggressive sound. Whether you are daily commuting or crossing the country, K&N provides the laminar airflow necessary for a high-performance riding experience.

Simple DIY Installation

Upgrading your Harley-Davidson air intake is one of the easiest maintenance tasks you can perform. With basic hand tools, you can swap your old paper filter for a K&N performance element in less than 10 minutes. The filter features a durable, precision-molded frame and an application-specific sealing bead to ensure an airtight fit against the throttle body, preventing “dirty air” bypass and protecting your cylinder walls.

Stop choking your Twin Cam engine. Upgrade to the K&N High-Flow Air Filter today and experience the ultimate in Harley-Davidson performance!