Audi is the worst with this stuff
People are bringing their highly modified '11+ 5.0’s and their new gt500’s with a very obvious pulley, intake, exhauat and tune and Ford doesn’t have a problem honoring the warranty. Obviously those components directly modded are, but stuff that should still be covered is still covered.
I had a friend with a 6.0 GTO with intake, manifold, stall, nitrous, cam, and full exhaust and GM had no problems honoring any part of the warranty, within reason.
Audi is pushing away the enthusiast. A very small percentage of buyers are modifying their Audi and they are saying pound sand? If they want the enthusias following then they still have to honor a decent warranty. So same to them, you have to pay to play.