[Kurt S]

I'm running an older oiled 4 hp Craftsman. Works fine if you're not continuously blasting. A bit bigger would be better. I also have a 960 cabinet.

I don't believe that 2 stage is important for volume, it's for pressure. Compare the rated CFM's a given pressure. (A 2 cylinder will crank out more volume. But in a 2 stage, the second piston is a smaller diameter to further compress the air from the first stage).