How can I set up a mud?

A modern top level Class V or VI mud racer is a dragster-style "rail" design, with a supercharged engine and/or nitrous oxide injection. Engines may be in the front or the rear. Vehicles are required to have four wheel drive. The sole difference between Classes V and VI is the tire type. Class V racers have D.O.T. street legal tires which are modified by cutting off chunks of rubber to achieve an optimum shape for traction. Class VI vehicles have paddle tires, similar to sand rails.