Competition Motorsports arrived at ThunderHill Raceway Park in Willows, CA on April 9-11, 2021. Preston Calvert #77, Jim Walsh #99, Michael Zuieback #2, Robert Hanley #44, Slade Stewart #14, Paul Nemschoff #4, and Mark Nemschoff #41.
For the first race, Mark Nemschoff finished first on the GT cup. Preston Calvert won second place overall and first in the master class. Walsh and Zuieback won second and third in the master class as well.
Second race, Zuieback won first place in the master class and Hanley got second in the master class. Mark Nemschoff raced again in the GT cup and won second place.
The last race, Walsh won first in the master class and Zuieback won third in the master class. Mark Nemschoff once again raced in the GT cup and got second.