With a rich history in racing and the street performance, Injen Technology has proven itself as a leader in filtration engineering and technology. Lab tested and race proven, Injen?s air filter line features state of the art designs and performance. All of Injen?s 8-layer cotton gauze oiled air filters feature a tightly layered media that is specified for our use, along with a proprietary filter oil that includes highly advanced tackifiers to stop as much dirt and contaminants as possible. This allows our 8-layer oiled cotton gauze air filters to flow the maximum amount of air, all while protecting your valuable engine from harmful dirt and debris. 100% cleanable with the use of our Pro Tech air filter cleaning kit ? part number X-1030. Order yours today! Technology 8-Layer Oiled Cotton Gauze Air Filter, Part No. X-1021-BR, 3.50" Flange ID, 6" Base / 6.875" Media Height / 5" Top. High Performance Air Filter; 54 Pleat Super Nano-Web dry air filter-3 1/2in. Black Filter 6 Base/6 7/8in. Tall/5 1/2in. Top