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Indeed. I voted "No" not because I believe it could be harmful to drive 20 miles on the stock tune with aftermarket gears, but because I believe it to be pointless.
Just my 2 cents, but if you are running out of warranty and the car is running fine, just leave all your mods how they are. A check up is a good idea, just be mindful what the dealer might suggest and how much they charge to do it. I personally dont see the need to temporarily return the car to stock form just for a check-up.
checkup because your going out of warranty soon?
who cares then, drive in at red line with a big *** grin on your face not like they will refuse to work on your car because it has an intake/tune on it