718 (982) 2.0 F4 BOXSTER. 718 (982) 2.0 F4 BOXSTER T. 718 (982) 2.0 F4 CAYMAN. 718 (982) 2.0 F4 CAYMAN T. 718 (982) 2.5 F4 BOXSTER S. BMC air filters are produced using a "Full Moulding" system that enables the characteristic red filter to be realized from a single mould with no welded joints thus avoiding easy breakage.