would you share info - what is allowed to modify not to loose warranty?
I know dealer can't prevent you from changing the tyres, but hey, is that fair when you are rolling on 235\40\17 instead of "allowed" 215\45\17 and claiming that some suspension bushings fail - would the dealer point it's finger on the 235s blaming them and refusing with warranty bushings replacement?
Also have you ever faced situations that dealers hounding trackday photos to mark your car as a @
sports event noticed, so writing you off the engine warranty?