Louisiana Mud Race! The Ultimate Tow Rig makes a return after Ian and Jessi travel to Southern California to help build the ultimate power plant - the first ever custom twin turbo Duramax diesel engine designed by Gale Banks. We build the motor from the inside out... with high tech components, to the awesome dual blowers that will eventually command over 700 horsepower, and 1000 ft lbs of torque! Later in this episode, Ian and Jessi bring the motor back to Xtreme and drop it between the frame rails of the Gorilla. Also in this episode, they are considered a different "breed" of off roaders - mud boggers! We travel to Monroe, Louisiana for some mud in your eye, ears, nose, throat, grill, cab etc! You get the point.