Air Flow of the Factory (OEM) Air Filter & Cover: 61.23 CFM Air Flow of the DNA S2 Cover with the DNA S1 Air Filter: 171.30 CFM DNA Air Flow increase: 179.76 % DNA Filtration Efficiency: 98-99 % It also fits: Yamaha XTZ 700 Tenere 19-22 Yamaha XTZ 700 Tenere Rally 20-22 Yamaha YZF R7 2022 Yamaha Tracer 700 16-22 Yamaha FZ-07 15-22 Yamaha XSR 700 16-20 Product Information: The new Stage 2 Cover is made by CNC from black polyamide 6 and is designed exactly to work ONLY with the DNA air filter. If you use it correctly it will increase the air flow, the torque and the power of the engine. A Fitting Manual is included in the Stage 2 Cover package and re-mapping the fuel injection is necessary. The filtration performance together with the DNA Stage1 Air Filter (R-Y7N14-01) is extremely high, at a rate of 98-99% (ISO 5011). The Air Flow is very high with DNA's new Stage 2 Cover (TC-Y7N14-S2), always in combination with DNA's Stage 1 Air Filter (R-Y7N14-01), it is 179.76% compared with YAMAHA's factory airbox and filter! Air Flow with DNA's Stage 1 and Stage 2: 171.30 CFM (Cubic feet per minute) @1,5"H2O @ 25 degrees Celsius. Air Flow with YAMAHA's factory airbox and filter : 61.23 CFM (Cubic feet per minute) @1,5"H2O @ 25 degrees Celsius. This DNA Stage 2 Cover is designed for road and race use. This Stage2 application has been developed for race and track use and in some countries it may not be legal to use it on the road.