I went through a similar ordeal at the first Roadkill and finally had them look over my tires with a magnifying glass to see the DOT, but not recommended for street duty all year round. I think they wanted cars running on street BFG/ Goodyear and Coker tires or something like that and I told them that any car with decent power AT THE TIRES should have a sticky tire at the very least, because not having so makes for a more dangerous situation in such a short distance.
My car was drunk for the first two rounds until I got a hold of it and the burn out sequence and brought back it's mojo game from back in the day.