Flashing your vehicle doesn’t automatically void your warranty. There’s laws that protect consumers from this type of stuff (Magnuson Moss Act)
With that said all dealers are different. I can’t comment on how each dealer will handle it but most of them are pretty mod friendly to a certain point.
My recommendation would for anyone in here would be to make nice with your service writer and feel them out. If they’re strict at the beginning for let’s say a lift and some wheels that’s not the dealer you want to be using. Find someone who is also passionate about the vehicle and become friendly with them and always make sure to tip them. You’d be surprised how far that goes.
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