Experience a true performance boost with the K&N replacement air filter for BMW, K&N air filter for BMW 1978-91. This filter delivers enhanced airflow, increased horsepower, and superior engine protection. Crafted with a state-of-the-art layered, oiled cotton media, it improves engine performance while effectively trapping contaminants. Its precision drop-in design fits perfectly into your factory air box, ensuring a quick and hassle-free installation.

Key Benefits

• Engineered Power: Innovative layered design optimizes airflow for improved horsepower.
• Durability & Warranty: Backed by a 10-Year/Million Mile warranty for lasting reliability over your vehicle’s lifespan.
• Reusability: Washable and reusable design minimizes waste and saves money in the long run.
• Easy Installation: Drop-in replacement fits directly into your factory air box, offering convenience and efficiency.

Fits:

• BMW 318i: (1984–1985)
• BMW 320i: (1980–1983)
• BMW 325e: (1984–1985)
• BMW 528e: (1982–1985)
• BMW 528i: (1979–1981)
• BMW 633CSi: (1978–1984)
• BMW 635CSi: (1985–1989)
• BMW 735i: (1985–1987)
• BMW M3: (1988–1991)

For more detailed technical information, please review the Technical Bulletin.

Upgrade today to enjoy superior airflow and enhanced engine performance. Discover more innovative products in our Air Filters - Drop In collection.