Ultimate Car Build-Off

Hollywood Hot Rods and Pure Vision have four days to turn a soccer mom minivan into a supercar before their creations are put through the paces at Willow Springs Raceway. The winner is one step closer to the $100,000 Grand Prize.

Speed Unlimited and Hollywood Hot Rods go head to head to transform their hearses into hill-climbers. The winner of this extreme-incline challenge will move one step closer to to the $100,000 Grand Prize.

Previous winners are back for a shot at $100,000 in the Los Angeles finals. Teams turn their Firebirds into flying cars and try to cover the greatest distance taking off from a 200-foot cliff at Eagle Mountain.

In Detroit, Team Z Motorsports and Alternative Automotive Technologies have to put the two front-halves of two different cars together to make one car that can drive in both directions.

Monkeywrench Racing and Voodoo Choppers turn two motorcycles into one four-wheeled vehicle with one purpose in mind - pull the longest wheelie they can down the mile runway at historic Grosse Ile Airport.

In the Detroit Finals, the Detroit semi-finalists face off by turning their trucks into tank tread vehicles. The winner moves on to the national finale for a chance at the $100,000 Grand Prize.

UCB moves on to Atlanta, where Atlanta Air Exchange and Mild 2 Wild have to build underwater vehicles from electric golf carts. These two father/son shops face off for the chance to compete in the Atlanta Finals.

Batlground Motorsports and Auto Extremes turn everyday cars into super-stealth-spy cars, complete with rockets, spikes and smoke. The winner of this challenge moves on to the Battle of Atlanta.

It's hot this week at the Atlanta Finals as the semi-finalists turn their personal water vehicles into hovercrafts! The winner will go on to the National Finals and possibly even win the $100,000.

It's LA vs. Detroit vs. Atlanta for the finale, and the three city finalists have to make a car or truck drive on water. The winning team is the champion and will receive the grand prize of $100,000 and the title of top garage.