DNA replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. These filters are washable and reusable and are custom designed to fit into your existing factory air box. Their drop-in design means adding performance is simple. They offer bigger air-flow, with almost 99% filtering efficiency. Installation of the filter is very easy, simply follow the information that can be found in the KTM workshop manual, also included with product. A specially made Laser cut supporting frame is embedded in the DNA filter. The filtering efficiency is extremely high at 98-99% filtering efficiency (ISO 5011), with 4 layers of DNA Cotton. The flow of this DNA filter is 23.87 % more than the KTM stock foam filter! DNA air filter flow: 113.90 CFM (Cubic feet per minute) @1,5"H2O corrected @ 25degrees Celsius. KTM stock foam filter: 91.95 CFM (Cubic feet per minute) @1,5"H2O corrected @ 25degrees Celsius. This DNA filter is designed as a High flow filter for road and performance use. KTM Duke Models: KTM Duke 125 (17-20) KTM Duke 200 (2020) KTM Duke 250 (17-20) KTM Duke 390 (17-20). Husqvarna Models: Husqvarna Svartpilen 250 (2020). Husqvarna Models: Husqvarna Svartpilen 401 (18-20) Husqvarna Vitpilen 401 (18-20).