Factory GTP program — two Porsche 963 LMDh prototypes defending their Sebring title.
Porsche Penske Motorsport won the 2025 12 Hours of Sebring with the #6 Porsche 963 driven by Laurens Vanthoor, Felipe Nasr, and Nick Tandy. They arrive in 2026 as the team to beat in the GTP class — and as defending IMSA series champions.
Two Porsche 963 factory prototypes competing in GTP class
Porsche Penske Motorsport is a landmark partnership between two of motorsport's most iconic names. Porsche, the German manufacturer with more Le Mans wins than any other brand, joined forces with Roger Penske — the most successful team owner in American racing history, with IndyCar championships, Daytona 500 wins, and decades of dominance.
This factory GTP program represents Porsche's full commitment to the top class of IMSA competition. The team operates with Porsche's full engineering and technical support, making it one of the most well-resourced entries in the paddock.
In 2025 they took the IMSA series title as well as the Sebring GTP win — arriving in 2026 as double defending champions with a target on their back.
The Porsche 963 is an LMDh prototype — a category that combines a standardized chassis with a manufacturer-developed powertrain and hybrid system. The 963 uses a 4.6-liter flat-6 twin-turbocharged engine (a configuration unique to Porsche in the top class) paired with a hybrid electric motor unit that together produce over 500 horsepower.
The car debuted in 2023 and has evolved through successive seasons into one of the most competitive GTP machines. It competes identically spec'd across both IMSA (as GTP) and the FIA World Endurance Championship (as Hypercar), giving Porsche Penske data from two global championship campaigns.
Laurens Vanthoor (#6 Porsche) and his brother Dries Vanthoor (#24 BMW M Hybrid) are both racing at Sebring 2026 — but for rival manufacturers. The Belgian siblings are two of Europe's most respected GT and prototype drivers, now facing off on the same track.
LMDh (Le Mans Daytona h) is a class of racing prototype using a common chassis from one of four approved manufacturers, combined with a manufacturer's own engine and hybrid system. This keeps costs manageable while allowing brand identity. Porsche, Cadillac, Acura, and BMW all compete under the same GTP ruleset.