My landlord collects antique autos that were service vehicles. This is the car that was parked under our place and filling the kitchen with gas fumes. Apparently an original police and/or fire department vehicle, as you might be able to tell from some of the alternate custom design.
This sucker is LOUD. Imagine a big car engine running without an enclosure and drop the pitch two octaves but keep it that loud, you have some kind of an idea what it's like to stand 20m away from it.