DNA Air Filters - Air Filter for Honda CBR 650 R /CBR 650 RA / CB 650 R / CB 650 RA 19-23This DNA filter features DNA's advanced FCd (Full Contour design). A perfect airtight sealing and trouble free filter installation for the user is guaranteed. Installation of the filter is very easy, simply follow the information that can be found in the Honda workshop manual. The filtering efficiency is extremely high at 98 99% filtering efficiency, with 4 layers of DNA Cotton. The flow of this DNA Fcd filter is high, 27. 93% more than the Honda