DNA Air Filters - Stage 2 Air Filter Cover for BMW R 1200GS 13-18 (Κ50) / R 1250GS 19-23This new "DNA Stage 2 Adventure Expedition Kit" replaces the stock BMW air filter and the "restricting" plastic frame.. Designed to "sit" lower than the stock filter, frees the 2 air flow passages that direct the cold air from the front of the bike to the filter. Smoothly directing the incoming air towards the lower air box, we eliminate restriction, turbulence and improving torque and power. With an active filtering surface of 132. 300 mm2 this "DNA