You can't really "define" what a Pro Mod is or isn't, just that you know one when you see it. Take the body off most of the cars out there, park the chassis side by side and there is zero difference. A 6.0 cert chassis is a 6.0 cert chassis. The problem is the body and the LOOK. The squashed body and long nose screams Pro Mod. Doc, Jerry and Reaper are as Pro Mod as it gets really, but with stock looking steel bodies and wheelbase. There was a thought about requiring a VIN number, but that would rule out some cars they don't want ruled out.

Kye Kelley looks stock, but is a glass body. Lutz 57 has a glass body. Chucks 55 has a glass body. John Doe is steel, but is an ex Pro Stock car, so it's a panel car with no VIN. These are not cars you want ruled out, so what do you do. You fall back on the "know one when I see it rule" and is what lots of no prep races are now doing