No necessarily the service guy, but I've read that people can get away with modding their cars and dealerships being OK with it - and then the complete opposite. My point is that everyone's experience is anecdotal.
That's what people I think people need to soak in. There is no 100 percent answer as people they will be dealing with are not 100 percent the same. Worried? Keep it stock. If not? Try your luck. Dealers are different. People are different.