hi guys wonder if anyone can point me in the right direction my rs6 is in a bad way it wont go over 70mph and runs awful it went to audi and they didnt no what the problem was then they said needs 2 new turbo's and an ecu.previously it showed a fault on the lambda also and on another fault check showed over boosting.basically im in surrey and want to no where is best to take the car it had an upgrade at amd but now they have swapped hands they dont seam to want to touch the car.i need to sort this problem asap but not many people seem to be able to look at it can u give me some options please????