K&N Drop-In Air Filter for 2005 WRX, 99-06 Impreza, 99-04 Legacy

K&N Engineering Drop-In Washable Reusable High-Flow Air Filter Upgrade airflow, protect your engine, and reduce waste. This listing is for one K&N Drop-In High-Flow Air Filter. It uses layered, oiled cotton media to maximize airflow while efficiently capturing dust and contaminants. Designed as a direct replacement for your factory filter, it installs easily into the original air box for a hassle-free upgrade. High-Flow Performance: Engineered to increase horsepower and throttle response by improving intake airflow. Washable & Reusable: Durable construction allows cleaning and re-oiling for long life—no disposable replacements required. Durability: Built to last for the lifespan of your vehicle with robust materials and professional-grade assembly. Easy Install: Drop-in design fits the factory air box on the 2005 WRX, 1999-2006 Impreza, and 1999-2004 Legacy for simple, tool-free installation. Warranty: Backed by K&N’s 10-Year/Million Mile Limited Warranty for long-term peace of mind. Choose K&N’s most popular performance filter to improve airflow, maintain engine protection, and lower ownership costs over time. Ideal for daily drivers and performance enthusiasts who want reliable gains without complex modifications.