Exton, the 2021 Kartsport New Zealand Sprint Champion, has quickly made a name for himself, finishing third in the 2023 Toyota 86 Championship. The Blenheim racer dominated the GT4 class in the McLaren Artura GT4 car for the 2024/2025 GT NZ Championship series. Claiming 5 of 5 pole positions and 11 of 13 race wins, William confidently took out the championship title.

Following in the fellow kiwi driver footsteps, Exton is now racing over in Australia as part of the Porsche Michelin Sprint Challenge Australia series, with TekworkX Motorsport.