In the spirit of where this topic is going, here is my proposal... whistle

Engine Containment Diaper only required on:
1) Chassis cars including dragsters
2) Professional Class cars (TF, Pro Stock etc.)
3) 8.50 and quicker 1/4 mile, associated 1/8 mile
4) All throttle stop classes (since they can run faster than the index)
5) Any car with a non-factory power adder (Nitrous, blower, turbo)

Specify cars with factory front frame rails do NOT have to have a diaper unless one of the above apply. wrench