2025 Porsche 911 GT3 RS MR polished in the ring

Porsche's 992-generation 911 GT3 RS is already one of the most powerful factory-built track cars money can buy, but Manthey-Racing is looking to improve the formula with a variety of performance upgrades.

A prototype 911 GT3 RS enhanced by Manthey has been spotted testing at the Nürburgring, where Manthey's headquarters are located, and the first upgrades should be available later this year.

The latest photos and video released by Car Spy Media show Manthey testing the 911 GT3 RS with a rather large rear spoiler with active features and a central connecting wing to the panel where the rear windshield is normally located The stabilizer fins are installed. A small vortex generator is mounted at the rear of the roof, and the rear diffuser is a new design. Manthey also fitted aero discs on the rear wheels of the latest prototype.

Most of the features are aimed at increasing downforce, especially in the rear, which helps keep the car glued to the road when cornering. The stock 911 GT3 RS already generates 1,895 pounds of downforce at 177 mph, which is twice as much as the 991-generation 911 GT3 RS.

On previous 911 GT3 RSs, Manthey's upgrades also included custom engine covers, adjustable coilovers, custom brake pads, and custom brake lines, and many of these, and perhaps more, are part of the latest machine's upgrades should be a part of the latest machine upgrades.

Mantie upgrades are typically limited to the areas of aerodynamics, brakes, and suspension. That said, the 911 GT3 RS's 4.0-liter flat-six should deliver a stock 518 hp, sending drive power to the rear wheels via a 7-speed dual-clutch automatic transmission. While peak power will likely remain the same, Manthey's work should shave a few seconds off the stock ring time of 6:49.328.

Manthey is Porsche's most successful customer racing team, winning multiple races and championships. This success has earned Manthey the right to operate as a Porsche factory team, including the World Endurance Championship, and Manthey upgrades are now offered through Porsche showrooms, including here in the US. However, the Turbo, Turbo S, and GT3 RS grades will continue unchanged in 2025. However, updates are planned for these.