ACI Motorsports is thrilled to announce an additional entry in the 2025 Pirelli GT4 America series, featuring the dynamic driver pairing of Dan Sibille and Loek Hartog. The duo will be piloting the No. 9 Porsche GT4 RS Clubsport. Dan Sibille brings extensive experience and proven success, having competed in Porsche GT3 Cup cars for several years, and, most recently, piloting a Porsche GT4 RS in the Porsche Sprint Challenge North America series.
Loek Hartog, an ‘up-and-coming Dutch racer,’ joins ACI Motorsports fresh off a stellar debut season in the Porsche Carrera Cup North America series, where he clinched the Pro Class Championship in a dramatic season finale at Circuit of the Americas. ACI Motorsports is honored to welcome both Dan and Loek to the team and is eager to see their combined talents as we elevate our 2025 Pirelli GT4 America program.
“Dan and Loek are equally excited to join ACI Motorsports, especially given our recent successes in Pirelli GT4 America and our Pro-Am class championship in 2024,” said Curt Swearingin, CEO of ACI Motorsports. “With our enhanced race efforts, technical advancements, and increased competitiveness in the series, we’re confident this partnership will elevate our 2025 campaign.”
“I’m thrilled to be joining ACI Motorsports and co-driving with Loek for the 2025 Pirelli GT4 America season,” said Sibille. “The team’s growth and achievements in recent seasons make this an incredible opportunity.”
“I’m proud to be joining the ACI Motorsports team,” commented Hartog. “I’m eager to help the team build on their previous successes while contributing as a coach and co-driver with Dan in the Pro-Am class.”
ACI Motorsports is proud to continue its race efforts in the 2025 Pirelli GT4 America season with two entries utilizing the Porsche GT4 RS Clubsport race car.
The Porsche GT4 RS Clubsport (#9), driven by Dan and Loek, will highlight support from several strategic partners, including ChillOut, Gemini Advisory Services LLC, Racing for Children’s and SimCraft. “We’re honored to partner with these “best-in-class” organizations, which represent excellence in driver cooling technology, advisory services for cybersecurity companies, children’s healthcare foundation, and simulation motion technology,” said Sibille.