A while ago I had asked my car alarm guy to see how it can be done on my car, he said insurances won't like it and won't cover you if you they know that you had a remote start on your car when by factory it didn't. I was going to do it for the same reason as well, i.e. to let the forged pistons expand and let the engine warm up before driving away. Even at work, I just sit around for couple of minutes after starting and mates joke around saying how my car cannot be used as a get away car lol.