From what I can see it's a small diamond plate / hitch cover with the #88, guess he's a Dale Jr. Fan. That's my best guess. Taste like beauty is in the EYE of the beholder, but I'm feeling kind today.:dunno:
We really need someone to captures some video of the flames coming out when it's dark outside. Both while the car is parked and when he's blasting off.
It could be it really looks cool...
Everyone loves it when Nate engages the propane torch on his Batmobile!