The S/C will freewheel when throttle is applied. Obviously it is the vacuum that the engine is creating that is turning the rotors. I have pretty much islolated the noise to the rear of S/C and as I said Dave at Magnuson felt it was problably the rear needle bearings that have failed. I am certain that there is no deeper problem such as in the engine as it runs very good and is quite. The noise is definately coming from the S/C.

Tone, do you have the number for Dell Financial? It is at least worth a call to them to see if it is covered. Thanks.