Ryan and his WCC crew forge a place in automotive history when they team up with living legend Carroll Shelby to build a one-of-a-kind Mustang. Then Ryan's 10-year-old son doubles the shop's workload when he not only makes his first sale, but helps plan the customization as well. With time winding down, tempers flare as salesmen Derrick and Mike go toe-to-toe in the front office. Matters aren't helped either, when Derrick's poor job performance leads to legal troubles for WCC.