Has anyone gone and how are they enforcing the rules?

I know that now if you run a non OE power adder, the NHRA makes you wear a single layer fire jacket.

Section 1A, located on page 24 of the 2006 NHRA Rulebook read as follows:
10.00 (*6.40 1/8 mile) and slower; all E.T. non-OEM supercharged, non-OEM turbocharged, or nitrous-equipped cars with an OEM or .024-inch steel firewall: Jacket meeting SFI Spec 3.2A/1 mandatory

In addition any car running over 135 mph will have additional requirements so please ask if you think you will be in that area.