I broke mine in the same as my Cobra R. Drive it to the track, check all the fluids, heat up the tires, and Drop the Hammer. Currently got 19000 miles and not one problem. Fixed an intermintent clutch release bearing squeal myself by winning the burnout contest at a local Ford show. Noise hasn't returned since that day. Tire wear seems to be my only issue. Been looking at all this worry about engine noise. I don't have it. When the noise causes the slippery stuff to run out the side its time to worry.