2003-2006
Allgaier ran additional ARCA races in 2003, making six starts in the #86 owned by his father. He had a sixth-place finish in his second start at Toledo Speedway, and later a best finish of third at Salem Speedway. The next season, he made only five starts but had a second-place at Toledo. In addition, he was a representative of the United States in the South Pacific Saloon Car Championship, where had two top-fives. In 2005, Allgaier ran seven races in ARCA, splitting time between cars owned by Wayne Hixson and Bobby Gerhart. He won his first career pole at Springfield, setting a new track record, and had four top-five finishes. He also made his NASCAR debut in the Craftsman Truck Series, making four starts in the #63 MB Motorsports/Dave Porter Ford. He failed to make five races and did not finish higher 26th. That year, he appeared on the Discovery Channel program, "Driver X: The Race For The Ride." The show's premise was Jack Roush searching for new talent to drive Roush Racing prepared vehicles in NASCAR's top 3 series.
In 2006, Allgaier made his first full-time run in ARCA, ending 10th. He got his first career win at the Illinois State Fairgrounds Racetrack, becoming the first Springfield area resident to win in the 72 year history of championship auto racing at the fairgrounds. He made three more Truck races for MB and had a twenty-first place finish at Kansas Speedway. In 2007, he won his second career ARCA race at Salem and finished fourth in points. He also won two features in a midget car at Angell Park Speedway and placed 3rd in the Chili Bowl behind Tony Stewart and J. J. Yeley.
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