This one is designed with the pioneering FCD design technology, which: A. Lets the pleated filter element follow the contour of the airbox precisely. B. Removes the dead spots that cause turbulence and cut power. C. Increases the air flow and the filtration efficiency, making use of the greater part of the filter's surface. The filter has a perfect airtight seal thanks to the high-quality EVA gasket, which is cut precisely and fitted at the factory, so that fitting the filter is guaranteed to be trouble-free. A specially made support frame is included with the DNA filter. Fitting the filter is very easy, you can simply follow the instructions in the HONDA manual. The filtration efficiency is very high, reaching 98% - 99% (ISO 5011). It can hold a high percentage of dust. The filter's air flow exceeds the factory filter by +43.60%. In more detail: - Factory filter air flow: 116.70 CFM (Cubic feet per minute) @1,5”H2O corrected @ 25degrees Celsius - DNA filter air flow: 167.60 CFM (Cubic feet per minute) @1,5”H2O corrected @ 25degrees Celsius