K&N High-Flow Original Lifetime Engine Air Filter for BMW (2015–2021) | 33-3051

Upgrade your BMW’s air intake with the K&N High-Flow Air Filter

The K&N High-Flow Original Lifetime Engine Air Filter is designed to move more air than a standard disposable filter, which can help your engine breathe easier under load. While results vary by model and driving style, the filter is engineered to support improved engine performance by increasing airflow and optimizing air delivery to the intake system.

Built to last, this washable, reusable filter is backed by K&N’s well-known 10-Year/Million Mile Limited Warranty, offering a durable upgrade from disposable filters. The media uses multiple layers of premium cotton gauze treated with a specialized tacking agent, creating a robust mesh that helps trap contaminants while allowing steady airflow.

Key benefits and what to expect

• Potentially increased horsepower and throttle response due to improved airflow
• Washable and reusable design that lasts the life of the vehicle
• 4-layer cotton gauze media with engineered protection against contaminants
• Easy installation: drops into the factory air box in minutes
• Eco-friendly choice that reduces disposable filter waste
• Made in the USA with durable construction for reliable performance
• Long service interval: clean approximately every 75,000 miles under normal highway driving
• Backed by a no-hassle 10-Year/Million Mile Limited Warranty

Real-world use and fit

Compatible with a broad range of 2015–2021 BMW models, including popular 3-series and 4-series variants. The filter is designed to fit directly into your factory air box, enabling a straightforward upgrade without additional parts.

In daily driving, you might notice crisper throttle response and smoother power delivery as the engine breathes easier. The washable design supports long-term use and helps reduce waste compared with disposable options.

Manufacturing and testing focus on performance and reliability, drawing on K&N’s motorsport heritage to inform material choice and construction. This combination aims to deliver a confident, performance-oriented upgrade for enthusiasts and everyday drivers alike.