Well, well. I drive a lot of supercars and I always thought that my RS3 was '******' fast. Faster than it should be. Anyhoo.. The car lost all decent drive when I was out and about. It would judder under acceleration and I had to keep it to 30MPH or so until I got to the Audi garage which was not far (so I risked it). It was like it was stuck in 12th gear! or the turbo had gone, or a major fueling issue. So the service guys calls me: Him: "Have you had the car chipped?" Me: "No, why?" Him: The ECU has been modified for performance. Me: "You're kidding? Then again, the car always did feel ballistically fast" Turns out they can't do mcuh about it. It is obviously not under any warranty but he is sure that it just the ECU that is the issue and not an engine issue per se. He says that Audi cannot touch it - is that right? Says I have to find out WHERE the previous owner got it 'chipped' and then get that company to bring their laptop to the car and 'delete' the mod? Until then the car is in limbo at the garage. I have not heard back from the Garage that I bought the car from. They, of course, denied any knowledge that it was chipped but, in this case, I do believe them as you can't 'see' that sort of thing. If the previous owner denies it then I am likely a bit buggered. I suspect there is a solution but might be painful. Funnily enough, it is two weeks short of it's 3 year warranty end and I was going to sell it.