I pulled the external belt off the front of the s/c and drove without the s/c, and there wasn't any noise at all. I ran it over 2500 rpm's on several stretches of road and didn't hear a thing. I called Powerdyne (which actually has good, friendly cust. svs.) and explained the situation to them and they are going to have to look at it. For now, I have a stock mustang again, it's a wierd feeling not having the boost
I'll let you guys know how it turns out. Later, Keith