BMC (FB845/20) High Performance Air Filter fits 2015+ Mercedes C63 C63s BMC Filters are constructed using a process called "Full Moulding" developed by the BMC F1 R&D team BMC air filters are designed and produced to ensure a higher air flow than OEM air filters BMC Air Filters are washable and reusable, perfect for high performance application The filtering material is composed of a special cotton gauze soaked with low-viscosity oil to give you the best air permeability