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Ultra4 USA is a National race series beginning each year at the toughest one day race in the world, King of the Hammers. Ultra4 cars are unlimited 4 wheel-drive race cars. Rocks, deserts, hillclimbs, whoops and trees may be found in an Ultra4 racecourse. The cars are capable of speeds of 120+ miles per hour paired with navigating the most technical rock trails in low-range, 4 wheel drive, to the quick switch of a wide open desert. Ultra4 Cars race annually in Johnson Vally, CA every January/February, as well as in the Ultra4 USA National Championship Series through the year. Races are held coast to coast.

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