BMW BMS Cowl Filter for E9X E8XE 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 dirt and debris from falling into the interior ventilation system? Well BMS has finally come up with a solution. These cleanable