[2] Cox provided a vehicle for now-retired NASCAR Grand National series driver Roy Bentley in four races that would take place in the 1955 and 1956 seasons.

[3] Darrell Waltrip,[2] Richard Childress,[2] and Cale Yarborough[2] have raced for Cox (in the lesser known series of NASCAR) and have become three of the biggest names in the NASCAR Cup Series.

Even though Yarborough had his championship wins record broken by Jimmie Johnson (in 2009) after defending it since 1978, he is still notable for being employed under Cox.

All of his vehicles were created right out of his garage (with the formal business name being Marion Cox Garage) which was located in Hemingway, South Carolina.

Due to his religious beliefs, Cox never allowed his vehicles to race on a Sunday (keeping him out of most of the Grand National Series races).