I thought that...it does change slightly when I move the steering, but that could be as it produces a load on the engine and the revs change, so the pitch does too. It doesn't get louder when moving the steering though.

As for the Supercharger...if the clutch doesn't engage till 2,900 rpm, surely it can't be the supercharger as it would not be moving as the engine is at idle ?

One thing I did notice, when sat in the car it sounds like it comes from the rear...but if you lift the Hood (bonnet in the UK) and remove the plastic engine cover it seems to quieten down a little, so the noise is amplified, albeit very slightly, through the engine cover. Also, with the bonnet down you can't hear it outside the car, only when sat in it.

Can anyone with and SRT-6 try this and let me know if they hear anything ??? Sit in car at idle, switch off heater, fan and radio, listen for background whine, engage "drive" listed to hear pitch change with drop in engine revs.

Cheers,
Simon