Please go back and read my post, where did I say they should? I'm willing to pay to play, I'm just asking for a opinion like Drewster opinion on how a part sold by let say Cobb who put a lot of hours on producing the part will cause another part in the vehicle to fail? I'm not here asking for excuses for Ford to honor my warranty after I installed a Mod.What do you want from a manufacturer. they sold you A, you added B,it became C . C broke, you want them to fix A I( wouldn't do it,why should they?
Once again, don't sweat the small stuff, you need a new head, got a piston out the side of the block left second gear at some intersection, it ain't going to be the dealer warranting your car. There will be a man from Ford with those special Delphi readers looking at your car and reading all your electronics.
Seems fair to me.