Porsche 911 GT3 Cup MR 30 2026: 560 hp, 4.2-liter engine and 15-car run

© Manthey Racing

Manthey has unveiled two anniversary Porsche race cars, and one of them uses an engine not found in the standard 911 GT3 Cup. The 911 GT3 Cup MR 30 gets a naturally aspirated 4.2-liter engine, while the 718 Cayman GT4 RS Clubsport MR 30 focuses on lower weight and revised aerodynamics. Production is limited to 15 examples of each model.

The most extensive changes are reserved for the Porsche 911 GT3 Cup MR 30. Its flat-six grows to 4.2 liters and produces 412 kW, or 560 hp, with 500 Nm of torque. By comparison, the standard 992-generation 911 GT3 Cup uses a 4.0-liter engine rated at 510 hp. The MR 30 sends power to the rear wheels through a six-speed sequential transmission.

Manthey also reworked the aerodynamics, fitted six-way adjustable suspension and widened the track by 20 mm at the front and 50 mm at the rear. Recycled carbon-fiber body parts and new lightweight forged wheels cut weight, while a centrally mounted radiator improves cooling and reduces its exposure to contact damage on track.

The Cayman GT4 RS Clubsport MR 30 takes a different approach. Its 4.0-liter flat-six retains 368 kW, or 500 hp, and 465 Nm. The emphasis is on weight, cooling and aerodynamics: it receives numerous carbon body components, lighter wheels, revised brake ducts, a new diffuser and a larger rear wing. Together, the changes reduce weight by about 5.7 kg compared with the base car.

The two cars show different ways Manthey pursues lap time. The 911 receives major powertrain, chassis and aerodynamic upgrades, while the Cayman concentrates on mass, cooling and aero efficiency. Manthey has also shown with its road-car packages how chassis and aerodynamic work can deliver gains without simply adding engine output.

Both cars are built for race tracks rather than public roads. Applications are open until October 30, 2026. Cayman deliveries are scheduled to start in November 2026, while the anniversary 911 GT3 Cup is due to reach customers in the first quarter of 2027.

The launch coincides with a major corporate move: Porsche has raised its stake in Manthey Racing to 67%. The companies plan to deepen cooperation on low-volume special models, Manthey performance kits and exclusive track programs. The MR 30 cars fit directly into that closer development relationship.