RJB Motorsports and Metalloid Corporation announced at the PRI Show today that young American Michai Stephens will join SCCA champion Clint McMahan as the Sturgis, Mich.-based team steps up full-time into the Cooper Tires USF2000 Championship Powered by Mazda in 2016.Stephens, 23, from Evanston, Ill., gained his introduction to the...