Just ordered my Gryphon

and I am so excited about getting it.

Really cant wait to get my custom tunes.

Got a cpl questions though, I checked the online manual on it but I didnt see these in there, plz excuse me if they seem dumb.
1. Do I need to return it to stock or unplug it when I turn the truck off?
2. I know you arent suppose to prgram it in cold weather, but will it hurt it to leave it in the truck overnight when the weather is cold?