[5] In 2021 De Haan also won the FEED Racing shootout, which utilizes the Mygale M14-F4 car and is organised by Jacques Villeneuve and Patrick Lemarié.

[10] Ahead of the main season he already won the Porsche Sprint Challenge Southern Europe with the team.

[15][16][17] De Haan also joined HRT Performance to compete in the Zandvoort round of the Porsche Carrera Cup Germany, in which he took a podium.

[18] In 2024 he made the step up to a full time seat with BWT Lechner Racing in the Porsche Supercup alongside duties in Carrera Cup Deutschland with Team 75 Bernhard.

His high heat battle with Larry Ten Voorde in the Nurburgring in the closing stages of the race post FCY intervention was one for the books.