I ran my truck that way for about a year and a half. The recirc. door is the easiest to do. If you have the Infinity stereo, you will now regret that purchase, as the amplifier is blocking access to one of the screws on the door motor. If you don't, its an easy swap. Contrary to HT's instructions, their new door can be installed through the blower access, you don't have to cut the intake grille as they suggest.