May seem like a bit of a stupid question...but how loud is the whine from the ATI Procharger P-1SC, and what psi is that at?

I've never really liked supercharger whine all that much, but I do think it can sound kind of cool if it's not too loud...I absolutely can't stand the Vortechs on the '03 Cobras, as they make the dominating sound rather than the actual engine.