Hi everyone, I have owned my Audi for 4 months now. After one week of ownership it had no power at around 80mph. A19 test and tune diagnosed air mass meter failed and changed it with a reconditioned one. Now I find the turbo cuts in when cold and the power is amazing. After about a mile the turbo fails and the car still revs but there is no power. I just love that kick in the back feeling. Please help me cure this problem.Thanks all.