Features Make: Honda CC: 650 OEM Air Filter Air Flow: 142.90 CFM DNA Air Filter Air Flow: 182.80 CFM DNA Increased Air Flow: +27.93% DNA Filtering Efficiency: 98-99% Product Information This 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 stock paper filter! DNA Fcd air filter flow: 182.80 CFM (Cubic feet per minute) @1,5"H2O corrected @ 25degrees Celsius. Honda stock paper filter: 142.90 CFM (Cubic feet per minute) @1,5"H2O corrected @ 25degrees Celsius. This DNA filter is designed as a High flow filter for Road & Race use.