High Performance Air Filter. The DNA air filter adds horsepower while letting your sportbike breath better. The efficiency of DNA Filters maximizes breathable surface area compared to the O.E.M. filters allowing you to get the most horsepower on any track day event. Features DNA's advanced FCD (Full Contour design). Extremely high filtering efficiency of 98 - 99%, with four layers of DNA Next Generation Premium Cotton. These air filters are washable and reusable. Drop-in hassle free installation (simply follow the information in the workshop manual). Drop-inn designed to be "spark safe" for racing use on highly tuned engines. Lifetime Warranty. Note: Fuel injection recalibration is suggested but NOT necessary.