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No it wouldn?t void the warranty.

The dealer and their tools will never know the tune is in the vehicle.
We build our tunes from the stock calibration and the dealer doesn?t have the ability to see the changes.
They can only do full flashes.

Generally the statements above are true. The dealer can only do full-flashes, which would over write the tune. Only exception would be if you had a problem car, and they called in a field service engineer who had the program downloaded and sent back to MI for a programmer to look at. Doesn't happen much, but it can happen. So, if someone had a serious problem, the programmer should revert it back to the original program.