K&N High-Flow Engine Air Filter for 2008–2019 BMW (33-2428) — Washable, Lifetime Performance

This high-performance replacement filter from K&N swaps directly into your factory air box and is built to last the life of your vehicle. Instead of disposable paper elements, K&N uses multiple layers of oiled cotton gauze to allow greater airflow while trapping contaminants. The result: potential gains in throttle response and sustained filtration with routine cleaning instead of frequent replacement.

How does this filter affect my car's performance?

The K&N High-Flow media is designed to permit more air into the intake than a typical paper filter, which can contribute to improved acceleration and engine responsiveness. Performance benefits will vary by vehicle and driving conditions, but the construction aims to maintain protection while reducing flow restriction.

• Engineered media increases airflow compared to many stock filters
• Multi-layer cotton gauze balances filtration and air passage
• Laboratory and track testing used during product development
• Pre-oiled for immediate installation and measured performance

Will this filter fit my BMW and how easy is installation?

This model (33-2428) is manufactured to fit specific BMW years and models listed in the product compatibility details. Installation is typically a straightforward replacement inside the factory air box and can be completed in minutes with basic hand tools.

• Direct-fit design for compatible 2008–2019 BMW vehicles
• No modification to the air box required for most installations
• Pre-treated with oil; drop-in ready out of the box
• Installation instructions and vehicle-specific fitment available from K&N

How often does the filter need maintenance and what does cleaning involve?

Under average highway driving, the filter typically requires cleaning about every 75,000 miles, though driving in dusty or severe conditions may call for more frequent service. K&N provides a cleaning kit and instructions; the process includes washing, drying, and re-oiling the filter media to restore filtration and airflow.

• Standard cleaning interval cited at ~75,000 miles under normal conditions
• Cleaning kit available from K&N with step-by-step guidance
• Reusable design reduces landfill waste compared with disposable filters
• Proper re-oiling restores the filter's dust-trapping properties

What warranty and quality assurances come with this filter?

K&N backs its filters with a limited warranty designed to cover many long-term issues, and the product is manufactured in the USA with controlled materials and processes. While no aftermarket part can promise identical results for every vehicle, K&N's testing and warranty reflect the brand's confidence in durability and build quality.

• Limited lifetime warranty with certain terms and conditions
• Made in the USA under K&N quality standards
• Constructed with robust materials intended for long service life
• Tested across both road and track environments during development

Who is this for: This K&N High-Flow Lifetime Engine Air Filter (33-2428) is aimed at BMW owners who want a long-lasting, serviceable alternative to disposable filters and who value improved airflow and throttle feel. It's a practical upgrade for daily drivers, performance-minded enthusiasts, and anyone who prefers an eco-friendlier filtration option that reduces recurring filter purchases.