At DMG Motorsports, we present the Hiflofiltro HFF4021 Foam Air Filter — a competition-grade, direct-replacement air filter engineered to keep your engine breathing clean while unlocking every bit of available power. Built to fit the factory air box, this filter is manufactured with premium dual-layer foam media developed specifically for high-performance off-road engines, making it a proven choice for riders who demand reliable filtration without sacrificing airflow.

Manufactured in the Netherlands, the HFF4021 uses Hiflofiltro's signature dual-stage foam construction, pairing a coarse outer layer that captures larger debris with a fine inner layer that traps dust — all while maintaining optimal airflow for maximum engine output. This filter is a trusted fit for Yamaha ATV applications including the YZF350, and it's fully reusable, so you can clean and re-oil it for season after season of dependable performance.

Features:

• Direct OEM replacement designed to fit the factory air box perfectly
• Dual-layer, dual-stage foam media manufactured in the Netherlands for maximum filtration and optimum airflow
• Coarse outer foam layer traps larger dirt particles while the fine inner layer captures fine dust
• Reusable and washable design allows for repeated cleaning and re-oiling without loss of performance
• Durable, flame-laminated foam construction bonded with adhesive that withstands repeated cleaning cycles
• Developed for modern high-performance engines to support increased airflow and horsepower
• Sold each

Fitment