The Haas team made its debut in the then-Busch Series in 2003 season as the No. 00 Haas Automation Chevrolet. Troy Cline attempted a total of four races for the team, failing to qualify in the first two attempts before making the race at Fontana. The team used the number 79 in this race, utilizing the owners points of Aramendia Motorsports. Jason Leffler ran the final four races of the season in the car. He made his debut for the team at Kansas in October, starting 11th and finished 16th despite wrecking during the race. After a pair of 11th at Charlotte and Phoenix, Leffler had his first top-five, starting 14th and finishing 4th.