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- '20 Raptor, '22 Explorer ST, '14 GT500, '03 F150
The original purpose of the Magnuson-Moss act was originally put in place to stop companies from denying warranty work just because you didn't use OEM parts and used aftermarket parts, but it also extends to aftermarket performance because of the wording used. My personal thoughts on this. By law Ford can't void warranty without proving the aftermarket part caused the problem. But we all know this doesn't mean they'll follow it. With so many little parts and major electronics, it is easy for Ford to find a way to blame the aftermarket part caused the problem. The biggest variable however, is the dealer IMO. The dealer can choose if they want to make a big deal of the aftermarket part, or they could just let it slide. Ford still is the decision maker, but a dealer could let it slide. Please note could. So it depends on how the dealer feels about the mods and if you have a good relationship with them. I've heard rumors about Ford and other aftermarket warranty companies are sending corporate reps to inspect vehicles on big ticket warranty cases like engines and such. Might just be rumors, but just something to note. In the end, this is a pay to play game. If you want to mod, mod and you're going to take the risk of voiding certain warranty cases.