David Leon Starr is an American professional stock car racing driver. He competes part-time in the NASCAR Cup Series and NASCAR Xfinity Series, driving the No. 66 Ford Mustang/Chevrolet Camaro for MBM Motorsports. He has also raced in the Camping World Truck Series, where he is a four-time race winner.

Motorsports Business Management LLC, operating as MBM Motorsports and Power Source, is an American professional stock car racing team that currently competes in the NASCAR Cup Series, NASCAR Xfinity Series, NASCAR Craftsman Truck Series, and ARCA Menards Series. MBM was co-owned and operated by Long and driver Derek White until early 2016, with full operation of the team being taken by Long and his family after White was arrested on smuggling charges.