If your happy to pay then that’s fine. I see too many tuned Audi’s where the owner isn’t happy to pay though.I haven't see much/read much about any failures on the MQB VAG cars with huge power with bevel box/rear ends...basically bulletproof. On the warranty - some folks just want to enjoy things and take the finanical risk...I get it....I did it on my Sportwagen but of course that's a $20K car, not a $60K car.
It may not be on the net but I can tell you from first hand experience that the bevel box’s and rear differential’s do fail. I’ve also had clutch failures too. Drive them hard with lots of launches and track use and this will happen eventually.
Also with the warranty if you tune the engine you loose coverage on engine, gearbox, bevel box, diff, driveshafts, all brake components and all suspension components.