I am considering to purchase a cambelt + water pump kit for my local garage to fit. That is rather than go to Audi for this service. Can any member enlighten me on what is the correct part to buy, or which is the best kit to buy. I see lots of different belts and kits on the market from different manufacturers, but have no idea which of these are the best. Which make is the one that Audi itself uses and where would be best to buy it? Car spec is as signature indicates. Any advice appreciated.