2025 Porsche 911 GT3 with Manthey Kit on Nurburgring
©2025 Porsche
Any serious driving enthusiast knows there is a fundamental difference between street cars and race cars. Street cars are built to be legal on public roads and comfortable for everyday use, while race cars are purpose-built for maximum speed and performance on closed circuits.​
Historically, the gap between the two was evident in performance, durability, and equipment (nobody would confuse the mission of the 1970 Porsche 917K with that of a 1970 Porsche 911 S). Yet modern advances in automotive technology and engineering have narrowed that divide. Today’s high-performance road cars can approach race-car levels of speed and handling, even though their designs must still balance comfort, safety regulations, and long-term reliability in ways pure race cars do not.
Manthey is a specialized Porsche racing and tuning company located in Meuspath, Rhineland-Palatinate, Germany, alongside the famous Nürburgring racetrack. Founded by Olaf Manthey in 1996, the company initially focused on racing, competing in the Porsche Supercup and achieving early success. By 1999, Manthey expanded into modifying road-legal Porsches under the Manthey Racing (MR) brand. Their strong performance and expertise caught Porsche’s attention, and since 2013, Porsche AG has been the majority shareholder of Manthey Racing. Today, Manthey combines racing success with high-performance tuning for Porsche road cars, maintaining close collaboration with Porsche as a factory partner.​
Porsche has announced a new Manthey upgrade kit for the 992.2 generation 911 GT3 that transforms the already track-ready coupe into a genuine podium contender. Despite the extensive performance enhancements, the car remains entirely street legal and retains its factory warranty.
Profile of the 2025 Porsche 911 GT3 with Manthey Kit
©2025 Porsche
While the GT3 delivers impressive downforce in stock form, the Manthey kit tweaks the aerodynamics to improve the coupe’s track readiness, producing even more downforce without affecting drag. The entire underbody has been tuned into a “continuous aerodynamic element,” says Porsche. The underbody tuning vanes are larger, and a new underbody pan smooths airflow. The front lip has been redesigned and extended, and diffusor fins on the underbody and sides improve downforce on the front axle. The GT3’s distinctive swan-neck wing is wider—with a Gurney flap—and the end plates are curved to improve airflow. Lastly, the rear diffuser has longer fins, and there are aerodiscs on the rear wheels.
Owners may adjust the rear wing to alter downforce based on the racing circuit. In its least aggressive setting, the Manthey kit provides 782 pounds of downforce. In its most aggressive setting, the number jumps to 1,190 pounds of downforce.
Manthey’s suspension upgrades include special four-way coilover dampers—adjustable for rebound and compression without tools (spring rates are increased 10 percent over stock on the front, to accommodate the additional downforce). The company also offers lightweight 20- and 21-inch forged alloy wheels that reduce unsprung mass by 13.2 pounds compared to the stock wheels. Brilliant Silver, Neodyme, and Black (silk gloss) are the available finishes. And to ensure braking precision, Manthey upgrades the stock brake lines with braided steel lines.
For those seeking even more Manthey upgrades, there is a full range of visual accents—from colored aerodiscs for the wheels, to colored tow straps and decals. And there is an array of carbon-fiber cosmetic accessories to create distinction with each customer build.
The upgrade kit delivers impressive results. According to Porsche, the 992.2 911 GT3 with the Manthey Kit lapped the Nürburgring Nordschleife in 6:52.981 minutes. That’s nearly 4 seconds faster than the factory setup with the optional Weissach package, and 2.756 seconds quicker than its predecessor, the 992.1 generation with the Manthey Kit (both vehicles were fitted with optional Michelin Pilot Sport Cup 2 R tires).
Porsche says the Manthey Kit for the 992.2 911 GT3 is expected to be available in the U.S. starting in Spring 2026—pricing will be announced at that time.