A 2.3 pulley is putting the M45 s/c at it's max ability to flow air at or near sea level. Running the s/charger faster will gain you nothing. Your next steps are to allow the s/c'd air to flow easier. Install the FR Big Valve head, a good header/cat back, and a ported TB or a larger TB. You won't have to cool the charger and your car will make more power with less supercharger load.Already got the BBK installed, but I want more. Never gonna be satisfied I guess. If I add the larger crank pulley, would the tune for the BBK be enough?