Dynes along with IndyCar legend Dario Franchitti are the only UK drivers ever to compete in both the NASCAR Xfinity and ARCA series.
In 2000, Dynes made his debut in the Busch Series alongside 2010 Daytona 500 and 2010 Brickyard 400 champion Jamie McMurray.
In 2001, in final practice at Lowe's Motor Speedway, Dynes was caught up in an accident which left him with back injuries.
2011 saw Dynes competing in the European Late Model Series; he drove the #51 Deuce brand-sponsored Chevrolet for British team Revolution Racing.
Dynes retired from racing in 2013 after suffering a serious leg injury at Venray Speedway in the Netherlands; he had 3 European late model victories and a total of 14 podium finishes.