We got a race car that had been repaired by them and the motor was built by them for a long time. The stock motor had 12% bleed down in all 4 cylinders....hmmm..much HP loss. Granted it was not an Audi, but if this is the work they do for a race car.....................?????? BTW, the guy who drove it for them still won, but the car was much faster after we solved the bleed down problem. Trish