DeutschTuning proudly offers BMC Panel Air Filter Replacements BMW X3 M | BMW X4 M 2019-2021. The panel/cylindrical air filter is commonly referred to as "replacement air filter". It is installed in the vehicle's original airbox to replace the OEM air filter. It is made of highly performing materials that allow an increased air flow combined with a more efficient filtration, guaranteeing containment of all impurities from as small as 7 microns (compared to OEM's 10 microns). BMC air filters are designed and produced to ensure a higher air flow than original paper filters.Made of the best raw materials. BMC use only alloy mesh with epoxy coating to ensure protection from petrol fumes and from oxidization due to the humidity of the air. The filtering material is composed of a special cotton gauze soaked with low-viscosity oil to give you the best air permeability.