Justin Michael Boston is a realtor broker and an American former professional stock car racing driver. A former development driver for Joe Gibbs Racing, he most recently drove the No. 54 Toyota Tundra for Kyle Busch Motorsports in the NASCAR Camping World Truck Series. Boston was the Rookie of the Year in the ARCA Racing Series driving for Venturini Motorsports in 2013.

Kyle Busch Motorsports (KBM) is an American professional dirt racing team that competed in the NASCAR Craftsman Truck Series. They formerly competed in the NASCAR Xfinity Series, CARS Tour, ARCA/CRA Super Series, Southern Super Series, ARCA Menards Series, ARCA Menards Series East, and ARCA Menards Series West, and was also the parent company of Super Late Model chassis constructor Rowdy Manufacturing. Originally fielding Toyota Tundras since its inception, the team switched to Chevrolet Silverados beginning in 2023. The team last fielded two full-time Chevrolet Silverados: the No. 4 for Chase Purdy and the No. 51, which was driven each year by the team owner Kyle Busch along with Jack Wood and multiple Chevrolet drivers from other NASCAR series.