This high-flow, K&N washable replacement air filter is engineered specifically for 04-11 BMW 520D, BMW 535D, and BMW 635D models. Designed to enhance engine performance with increased horsepower and improved airflow, this filter uses layered, oiled cotton media to effectively trap contaminants while promoting a cleaner, more efficient combustion process. Enjoy a drop-in installation feature that makes upgrading your vehicle’s factory airbox a straightforward process.

Key Features:

• Increased Horsepower: Notice a boost in engine performance with optimized airflow.
• High-Flow Design: Advanced patented design offers superior air passage and minimizes restrictions.
• K&N Washable: Reusable construction helps reduce ongoing maintenance costs and environmental waste.
• Drop-In Installation: Replace your factory air filter with ease, no professional help required.
• Engine Efficiency: Reduces contaminants that can impede performance, supporting a longer engine lifespan.

How It Works

This replacement air filter functions as a true drop-in solution for your BMW’s factory airbox. Its precise design ensures a perfect fit and reliable performance right from the start, making installation effortless for both enthusiasts and professionals.

Maintenance & Warranty

For best performance, clean your filter every 75,000 miles or every 5 years under typical driving conditions. Enjoy peace of mind knowing your investment is protected by K&N’s No-Hassle Lifetime Limited Warranty. Upgrade your engine performance today and experience the ease and efficiency this high-flow filter provides.

For more top-quality air filters, check out our Air Filters - Drop In collection.