just to share this with u guys. took my car in for a service, all was well. i told them about the whining noise and the lack of power compared to normal coming from the engine, i was hoping it wasn't the turbo! picked it up at 5pm yesterday, i've had a performance exhaust fitted. cutting a long story short the guy 'cleverly' explained they could not find a fault and the noise was probably due to the exhaust as the air flow is improved and the engine wasn't able to cope with it. he explained it so well that it got me and my cousin thinking maybe there is something wrong with my exhaust, which to start with i didn't think it was as it's only a few months old. i wasn't clearly satisfied so today i took it to a corner garage and literally within 5 minutes he diagnosed the problem. he got my car up on the ramp and found a split/cut in the pipe connected to the intercooler. i thought audi technicians had years and years of experience, but all they could do was blame it on my exhaust. idiots!!