DNA filtering media is made up of 4 layers of an oil impregnated `nafta surgical-quality cotton gauze specially developed by DNAs in-house R&D team. The cotton gauze is then sandwiched between 2 layers of Epoxy coated Marine Grade aluminum wire mesh before being robotically pleated to DNAs unique `large pleat edge radius patterns. The result is an extremely high-flow filter (98% efficiency) which exceeds any of todays motorcycle needs. It offers increased potential performance efficiency and drivability combined with long-lasting durability. H-D with S&S B/D air cleaner housings