The DNA High Performance filter for KTM 2018-19 790 Duke features DNA’s advanced FCd (full contour design). Installation of this new DNA Air filter is very easy with instructions included with the filter. The filtering efficiency is extremely high at 98-99 percent (ISO 5011), with four layers of DNA cotton. The flow of this new DNA filter is +19.70 percent more than the stock filter. The filter is designed for road, race and off-road use.