Red or Blue BMS Cowl Filters for BMW E9x E8x & X1Description Better engine sound, engine cooling, and a weight savings of 10lbs. Now in Colors! Black, Blue, & Red Filter Elements. E chassis BMW owners have known for some time that removing their cowl and HVAC filter system not only reduces vehicle weight but also improves overall engine bay cooling, facilitates engine & DME box access for service, and lets the driver better hear how the engine is running. But there was always a catch. How to stop