 However, with ongoing sponsorship difficulties midway through the season, Lester stepped out of the truck, handing it over to drivers Denny Hamlin, Andrew Myers, J. R. Norris and Shane Sieg.Rookie Marc Mitchell was signed to compete for Rookie of the Year in the 15 with Hyprene Ergon sponsoring for 21 races in 2008.He drove thirteen before being replaced by a variety of drivers, including Hamlin, David Stremme, Ryan Lawler, Kenny Wallace, John Andretti, James Buescher, and Jason White.