I seriously doubt the CFM output of the smog pump is anywhere close enough to make a difference on the typical automotive engine. But I bet it would work on a 5hp Briggs and Stratton go cart!

A small 4v carb delivers about 600cfm through an opening of approx 5". The best I remember, the smog pump has a output hose of about 1". Even if the impeller is large enough to deliver,(I doubt) the ducting is not. Maybe if you are good, you could somehow mount three or four pumps on an elaborate pully system... Imagine trying to blow a pin wheel with one nostril, no mater how hard you blow,(psi) the nostril can not deliver enough air(cfm) to turn the wheel. Make sense? lol...