In late 2014 two Challengers fielded by Miller Racing with the support of SRT and Mopar driven by Cameron Lawrence and Joe Stevens started racing in the Trans-Am Series's TA2 class. Both cars used a spec Howe road racing tube chassis with fiberglass bodies. Powered by a Hemi 392 slightly modified for road racing extremes and restricted by class rules, the cars made around 500 horsepower. Except for slightly bulged fenders and large rear wing, the cars look very much like the stock/street version, despite being roughly 7/8s the size of the road car. Lawrence won four of 12 races in the 2015 season, finishing third overall in the Trans Am TA2 championship.