Porsche today announced U.S. availability of Manthey Kits intended to further enhance two of the most track-focused 911 variants in recent times – the Type 992 GT3 RS currently in production, and the Type 991 911 GT2 RS, which was produced from model years 2018 to 2020.
Type 992 911 GT3 RS: More than one ton of downforce at 177 mph
The Manthey Kit for the 911 GT3 RS is easy to spot thanks to its extensive aerodynamic modifications. The new front lip, which is supported by carbon fiber reinforcements, is much larger and has a new wing profile. This revision, along with revised Gurney flaps for the front wheel arches and dual dive planes attached to the left and right sides of the front fascia contribute to an increase in downforce at the front axle.
The kit includes a carbon fiber panel that is installed in place of the rear window, bringing a 25 percent weight savings compared to the glass it replaces. A carbon fiber shark fin, which improves cornering stability and is inspired by the 963 World Endurance Championship-winning race car sits over the CFRP panel.
Combined with six additional roof fins, the shark fin diverts hot air from the front radiator to promote cool air induction for combustion, even under extreme conditions. The split DRS rear wing – in conjunction with significantly larger wing-end plates – increases rear downforce at the rear axle. A significantly widened rear diffuser with longer carbon fiber fins adds downforce without increasing drag. Carbon fiber aero discs reduce drag and complete the aerodynamic package to optimize airflow.
Overall, downforce increases by 20 percent with no additional drag. At 177 mph, the 911 GT3 RS Manthey Kit produces over 2,200 lbs. of downforce. This allows the driver to carry more speed while turning, especially through medium- and high-speed corners.
Type 992 911 GT3 RS: Semi-Active Coil-over Suspension
The spring rates of the semi-active coil=over suspension have been adjusted to compensate for the increased downforce, increasing 30 percent at the front axle and 15 percent at the rear. Four wheel and three body acceleration sensors work with a newly developed control unit to automatically adjust the dampers with extreme speed and precision.
The new dampers feature two separate valves for compression and rebound, each independently adjustable. This allows for precise tuning to match changing driving conditions and track surfaces, maximizing stability. Depending on the driving mode (Normal, Sport, Track), different settings are available. In Track mode, the base setup can also be manually fine-tuned using dials on the steering wheel to suit personal preferences.
Type 992 911 GT3 RS: Track-Optimized Brakes
The brake components of the Manthey Kit are designed to meet the demands of track use. The braided steel brake lines provide even more direct pedal feedback and more immediate response to braking inputs.
Type 992 911 GT3 RS: Additional personalization options
For those looking to add a personal touch, the 911 GT3 RS can be further customized with visual enhancements. Illuminated carbon fiber door sill guards with white Manthey lettering and decals on the carbon fiber aero discs are available. Manthey decals in Neodyme, white, and black are available for the doors. Customers can also specify a towing eye in red, black or yellow- that can be fixed to either the front or rear bumper through the appropriate threaded hole. This part is intended for use only on tracks.
Type 991 911 GT2 RS: Making the limit more attainable
Using components precisely matched to one another the Manthey Performance Kit consists of chassis, aerodynamic and brake components specially developed for the 911 GT2 RS and includes the Weissach Package’s light magnesium alloy wheels. As with the 911 GT3 RS, the aerodynamic components are immediately noticeable; additional flaps on the front spoiler increase downforce on the front axle in combination with a carbon underbody and new air guide elements in the area of the front wheels.
Downforce increases from approximately 108 to 154 lbs. at 124 mph, and on the rear axle from about 205 lbs. to 440 lbs. at the same speed. This is made possible thanks to a new rear spoiler, a modified diffuser and aerodiscs on the rear wheels. The track-optimized coil-over suspension benefits from the many years of motorsport experience at Porsche and Manthey. The front shock absorbers can be adjusted to three different settings and there are four settings on those at the rear. Steel-encased brake lines ensure even more direct pedal feedback.
The magnesium wheels, 20-inch diameter at the front and 21-inches at the rear, save a total of approximately 25 lbs. and are available in Brilliant Silver, Black, Aurum, White Gold Metallic and Platinum. An additional water tank for spray-cooling of the intercoolers increases overall volume by approximately 2.3 gallons (roughly nine liters), thereby increasing the time between refills.
In both cases, the kits are available through Manthey Certified Porsche Centers. Porsche Cars North America first began offering Manthey Kits through Aftersales in the U.S. in 2023 with initial availability specific to the 911 GT3 (Type 992.1).
Availability & Pricing
Today, there are 45 Porsche Centers certified to sell and install Manthey Kits, which are developed in close cooperation with the engineers in Weissach. Offerings include the Type 991.2 911 GT3 RS and 911 GT2 RS, the Type 992.1 911 GT3 and 911 GT3 RS, and the 718 Cayman GT4 RS. In all cases, the kits yield a car that is even more track focused than the standard vehicle.
Both kits are available to order immediately through Manthey-certified U.S. Porsche Centers with delivery expected by Spring, 2025. MSRP for the 911 GT3 RS Manthey Kit is $116,160. MSRP for the 911 GT2 RS Manthey Kit is $113,140. Both prices exclude taxes and dealer installation costs.
Above content © 2025 Dr. Ing. h.c. F. Porsche AG reviewed and edited by Rex McAfee
