Need opinions please guys. 6 weeks ago I remapped a smart 80bhp roadster. Took boost to 1.3bar and increased rev limit to 6200. Have done this loads of time before, sometime a small amount of boost wavering due to faulty cycle valve/boost control solenoid. Explained this to customer who told me " I have my own mechanic !". On Saturday he comes down and demand a refund as the boost is still wavering and it still wont achieve 6200rpm. I informed him that 6 weeks is way to long to expect a refund and HIS mechanic should have sorted the boost leaks by now. What do you all think ??