From what I was told none of the chips or programmers are undetectable, wether they have a stock setting or not. I set mine back to stock and they could still tell that It had been in there. Just trying to give ya a heads up. I know that some dealers dont care if you put a chip in it and then bring it back for warrenty, and then again some are real sticklers about, and wont touch the truck if its had a chip or programmer in it. In the end its your call, you may want to check and see where your dealer stand with warrenties and modified trucks. Good luck.