Unless you screw something up on the install there is no way to know.
Even if it throws a code you can play dumb and there is nothing they can do if you have it back to 100% stock.
I know a few people that swap there tuning setups on and off every time they go in. Same with DP, full exhaust, etc etc. Main thing is that if you are worried about it, swap it out before you go in.