Here's the truth of the whole thing.

There was two completely separate builds going on. The General Mayhem from Roadkill was being built by Diversified Creations to go back to Rally Fish school and make it kinda the Ultimate General Lee kinda thing.

The GMG guys were building the Drag Dart (way before the 17 days they said).

Dodge came in and said, "Hey, you both are building two Hellcat powered vehicles, why not race at the Silverdome?!".

So they pressed Roadkill to throw out the challenge.... and the rest is TV magic history.....