Terrible design, the sunroof drain hose passes through all the electric components in back of the car, the hose connection to the sunroof is absolutely stupid design. The hose connects to the internal side of the plastic sunroof fitting instead of the external side with a clamp and it's attached with glue then the sun damages the glue and the hose leaks. The leak goes by the external side of the hose to the Bose stereo amplifier, GPS and DC loader, in my case the water burned the amplifier and it's very expensive and also got the the GPS and DC loader wet. Hopefully the water didn't get inside those other components. A guy in LA sells and repairs those amplifiers and told me that all Q7, A6 and other Audi models with sunroofs have that problem, he receives tens of those amplifiers to fix. Also the car had other issues like the right power mirror didn't work, I have to replace the gas cap door electric latch I couldn't put gas to the car I couldn't open it, also I had to replace the back gate lock. I don't recommend Audi. For a luxury car it has a lot of problems and bad design, I'll never buy another AUDI