_Zerocool_ is 100% correct.
All you have to do is use genuine audi parts. Your grandma can do the work, it wont affect the warranty.
I stayed clear of Audi for a number of reasons,
A- i dont want my car test driven, IE taken for a joyride. (which they always do as its general policy)
B- i dont want it washed (they will wash it, even with a thick marker pen written across the job card say DONT)
C- its a modified car, i'd rather Audi didnt know, and in the event of catastrophic engine failure or the like, nothing can be said when it rocks up to the dealership completely standard and them none the wiser...
I know id rather stand under the ramp with a friend doing it and watch, than to sit at home biting my nails thinking, jesus, I bet they've cocked something up.
£67 with genuine parts