I run a heater box out of a older Pathfinder (not sure what year it came out of) in my car. It sits where the glove box used to be, and runs into my factory vents inside the car, that heats the foot and window area. My good friend Jack from Racetronix made me up a custom 2 speed harness to turn it on and off. I still get great heat and retain all the space under the hood.