Josh, there is more to the rule than what Greg cites:

Carpets, center consoles, floor mats, headliners, sun roof liner and frame, dome lights, grab handles, and their insulating, attaching or operating mechanisms may be removed. Sound deadening (melt sheets) and undercoating may be removed. Door interior trim panels may be replaced with 0.060" - 0.065" aluminum securely attached to the door. All other interior trim panels, except the dashboard, may be removed. Other than to provide for the installation of required safety equipment or other authorized modifications, no other driver/passenger compartment alterations or gutting are permitted.

That's a pretty recent change. I think it was enacted due to that fact that we were all removing undercoating as "insulating material" and the rule may not have been that explicit.

I mean, ALL IT car builders should have to go through the forced ritual of undercoating removal...without it, you rule aren't an IT guy.....