Originally Posted by BMWM.D.
Yeah, that's the main thing. As long as it comes in stock and has a legitimate wastegate failure, you should be good to go. Most dealers and Techs/SA's are easy to work with if you do that -- even if they know the car was modified.
But bringing in a modifed car and expecting a flat-rate Technician to remove/install aftermarket parts (intercooler, downpipe, etc.) during a warranty repair is another story. That's the sort of thing that will get your coverage denied. Bringing the car in 100% stock would be my advice for anyone considering getting this done.
Ok... I think I am getting trolled... why are you telling me stuff that I already know?