I called
www.tfbraceway.com today, asked the man that picked up a few questions and didn't mention I had a Mayhem until the end of the conversation... the man perked up talking about how great the car is. He said that most of the racers in his area use the Mayhem and that he has a few parts in stock; not because of availability, but because the car is so reliable. Pointless, but I thought I would share because these guys get drilled the same questions everyday. This is the first time I got such a great response about a car/truck.
I do not know if anyone has heard of Toys for Boys - they have three race tracks on site. Very cool place.