K&N Filters air filter details
K&N Filters Replacement Air Filter for 21C Honda SXS520M2 Pioneer 518 – Red (KNNHA-5221)
The K&N Filters Replacement Air Filter for 21C Honda SXS520M2 Pioneer 518 – Red (KNNHA-5221) delivers efficient engine protection and optimized airflow for enhanced UTV performance. This replacement filter is designed to fit the Honda Pioneer 518 and features a durable round rubber top. Its washable, reusable design reduces maintenance costs while maintaining filtration performance in harsh environments. This air filter is ideal for off-road and utility use and ensures consistent power and reliability.
Features and Specifications:
Vehicle Fitment: 21C Honda SXS520M2 Pioneer 518 models
Top Type: Round Rubber
Height: 4.563 in (116 mm)
Inside Diameter: 3.125 in (79 mm)
Outside Diameter: 5.125 in (130 mm)
Increased Performance: Boosts horsepower and acceleration for off-road vehicles.
Vehicle Compatibility: Ideal for Motocross, ATVs, UTVs, and Side-by-Sides.
Cotton Media: The pleated design provides a large filtration area for low restriction and extended service life.
Efficient Filtration: Multiple layers of woven cotton gauze deliver excellent air filtration.
OEM Fit: Installs directly into the factory air box with an application-specific sealing bead for a precise fit.
Reusable Filter: Washable and reusable; most units come pre-oiled and ready to install.
Product identification
- Brand: K&N Filters
- Model / MPN: KNNHA-5221
Air filter replacement: see the listed specifications for this model.




