He competes in the Tudor United SportsCar Championship for Magnus Racing, as well as the NASCAR Canada Series.
He also competed at the KONI Challenge Series and earned a class victory at Watkins Glen International.
In 2002, he won the KONI Championship in the ST Class, despite not winning a single event.
For 2008, he co-drove for the #15 Ford Mustang Cobra team of Blackforest Motorsports along with Tom Nastasi, David Empringham and Boris Said, Dumoulin drove two races that season (Daytona and Montreal).
Italics – Pole position earned by points standings or practice time.