I put my GT on a rolling road a little while back.
Rolling roads don't like auto's and so the print out looked more like a heart beat monitor than a power curve and it only made 390bhp at 5000rpm as the ECU wouldn't allow it to go over 120mph whilst the front wheels were still.
The ABS, Stability Control, suspension warning and the "take to dealer" lights all came on and stayed on after turining the ignition off and on again... I managed to fix it all with a full throttle launch, lighting up the rears and then slamming on the brakes, where upon all lights went out! Personally the highlight for me was standing next to my car doing 120mph and the sound of the V8 going through the gears was great, other than that a bit dull tbh.