But nothing compares to the ingenuity that the guys at Grind Hard Plumbing Co. used to build this ludicrous off-road electric shifter kart ... and off-road tires, a custom skid plate to protect ...

The latest is this one-of-a-kind shifter kit with a jet engine built by "Turbo" Tim Arfons, according to Winding Road, who is the son of Bonneville Salt Flats legend Art Arfons. The kart features ...