[Pete Munroe]

My MSD is under the dash on the passengers side, the box is bolted on the cowl crossframe and has air flow under and over.

Seems if it was in the glove box where there will be no significant air flow...maybe not ideal...but, generally, in my car it is a lot warmer under the hood than in the passenger compartment.

I would vote for the passenger compartment, or maybe up in the front of the car forward of the radiator bulkhead...( not great in the rain, just don't mount it upside down.)

Pete