[3] The following year, the Munster duo won the Rally Nationale Terre de Vaucluse, with Grégoire co-driving a Porsche 911 Carrera RS Proto.

[17] He showed progress to his debut year, as Munster followed two top ten results up with his first podium, as well as first ERC stage win, in Portugal.

[18] Another strong result with second at Hungary followed, though Munster lost out on the ERC1 junior title after suffering an early puncture at the Rally Islas Canarias, leaving him third in the overall standings.

[32][33] With Ott Tänak's departure from Ford, M-Sport promoted Munster to contest the 2024 WRC season in what was titled a learning year.

[34][35] Down on mileage compared to his more experienced WRC competitors, Serderidis-backed Munster struggled heavily, making defining errors in Monte Carlo, Portugal, and Finland among others.

[38] Despite encountering a puncture on Friday and crashing out on black ice late on at Monte Carlo, Munster impressed with his pace, as proven by his maiden stage win in SS10.