Yes, they testdrove the car.Did the garage take it for a drive?
The CSC has a nice deep grumble on idle and low revs, after about 4,500 it has a weird whooshing noise all the way to the redline. I'm not a fan personally. The whoosh is due to turbulence. You can't hear it very well in the car at the top end. Get someone to drive the car and you watch from the outside Erik. :0