Looked quickly at a website and the cfm ratings go up with the duty cycle and model numbers. It looks like the high end pumps run 3.53 cfm at 0 psi for 2 pumps.
www.onboard-air.com/Dual-Compressor-Packs/
Does anyone have cfm ratings for a York?
Also I would rather have the York in my current serpentine belt system than put it on the side on a v belt.