Looking at buying an 07 M6 with Evo sport headers and ecu programming. Will this void the BMW warranty?

 

only 3 tuners maintain a warranty: Dinan, Alpina, AC Schnitzer (if i remember correctly, those are the three). otherwise, the aftermarket parts will have voided the warranty where the parts are concerned. i can't remember the exact name of the law, the Magnusson something or other Act which basically says a mod won't void a warranty if that part has nothing to do with it (so swapping out your springs won't - or shouldn't - affect a warranty issue when your un-modded engine explodes).