K&N Engine Air Filter for Subaru H4 2016–2026 — KNA-5064 Long-Life 18,000-Mile High-Efficiency Replacement

K&N Advantage Plus 18,000-mile engine air filter (KNA-5064) is a long-life replacement made to fit select 2016–2026 Subaru H4 engines, delivering extended service life and high-efficiency filtration in your factory air box.

This K&N filter is engineered as a direct-fit replacement for multiple Subaru and compatible Mitsubishi models. It swaps into the stock air box in minutes without modification and uses a premium synthetic or cellulose-blend media to trap contaminants while maintaining airflow. Designed to meet or exceed OEM fit and function, it’s intended for drivers who want longer intervals between air filter changes and reliable engine protection.

How does this filter extend service intervals compared with standard filters?

The Advantage Plus KNA-5064 offers an 18,000-mile recommended replacement life—about 50% longer than typical 12,000-mile disposable filters. That extended interval reduces maintenance frequency and lowers ownership hassle for many drivers. The longer life comes from durable filter media and sturdy construction that resist collapse and degradation.

• Rated for up to 18,000 miles under normal highway driving.
• Durable construction resists wear over extended service.
• Reduces number of filter replacements per year.

Will this K&N filter protect my engine while maintaining performance?

K&N designs its Advantage Plus media to balance filtration efficiency and airflow. The media captures a high percentage of harmful particles—up to 99% in K&N’s specification—while allowing adequate air delivery to the engine. That combination helps preserve engine components without compromising everyday drivability.

• High-efficiency media captures most airborne contaminants.
• Engineered to maintain proper airflow for engine performance.
• Meets or exceeds OEM protection and fit standards.

Which vehicles is the KNA-5064 compatible with and how easy is installation?

This part is a direct replacement for a range of Subaru H4 models and some Mitsubishi fitments: Ascent, Crosstrek, Forester, Impreza, Outback, WRX, Legacy, XV, and Mitsubishi Outlander PHEV where listed. Installation takes only minutes in most cases because it installs into the factory air box with no cutting or modification required. Keep your vehicle’s original clips and seals in place for a secure fit.

• Compatible with 2016–2026 Subaru H4 1.6/2.0/2.4 L models and some Mitsubishi models.
• Direct-fit design for factory air box — no modifications needed.
• Simple swap using existing clamps and mounting points.

What warranty and expected maintenance should I plan for?

K&N backs this Advantage Plus filter with a 1-year limited warranty for defects in materials and workmanship. Replace the filter every 18,000 miles under normal highway driving; more frequent inspection or earlier replacement is recommended for dusty or severe-use conditions. Follow routine service intervals and check the filter visually when performing other maintenance.

• 1-year limited warranty included.
• Replace at 18,000 miles under normal highway use.
• Inspect sooner in dusty or off-road conditions.

Who is this for: The K&N Advantage Plus KNA-5064 is aimed at Subaru owners and compatible Mitsubishi drivers who want a longer-lasting replacement air filter that installs easily in the factory air box. It suits commuters and highway drivers seeking fewer maintenance stops, DIY enthusiasts who prefer direct-fit parts, and anyone who wants trusted filtration performance without altering the intake system.