High performance drop-in replacement for the factory air filter; fits BMW F8x M3 & M4 factory airbox for improved airflow and performance.
Proper airflow is crucial to an engine’s performance. When it comes to a precisely engineered automobile like the M3/M4, every bit of optimization will help you get the most from your engine. That’s why we provide these BMC F1 replacement air filters. They fit perfectly in your BMW's OEM air boxes and are built with the highest quality materials.
Starting with its outer frame, BMC uses a special soft rubber material made in a process called "full molding", which not only provides a much tighter seal around the filter, but also eliminates any potential cracking or breaking of the filter. The filter element itself is made of a washable cotton material that provides nearly 40% greater airflow than paper, enclosed in an alloy mesh screen which helps the filter keep its shape and protects against larger debris and dirt. The increased flow of air through the filter provides a steady stream of clean air to the engine, resulting in much more consistent and efficient power.