Demoustier began his career in 2008, competing in the THP Spider Cup and the Mitjet Series.

He also took part in the 24 Hours of Spa, finishing 21st in a Gulf Team First Lamborghini Gallardo LP560 GT3.

[1] Demoustier began 2011 with a brief return to single-seaters in Formula Renault 2.0 Alps.

He took a podium at the season finale when he switched cars within the team to partner Mike Parisy, who claimed the series runner-up spot in the process.

(key) † 10 Championship points deducted for sealing an additional turbo after scrutineering.