The Manthey Racing Manthey Kit for 991.1 Porsche 911 GT3 RS transforms an already ferocious machine into something even sharper, blending motorsport engineering with street-ready refinement. Designed in collaboration with Porsche and executed with Manthey’s relentless pursuit of performance, the kit delivers targeted enhancements to suspension, braking, and aerodynamics, elevating both safety and speed. For those chasing precision on the track, it is the ultimate step toward unlocking the car’s true potential.
At the heart of the Manthey Kit is a suspension overhaul that redefines how the GT3 RS connects to the tarmac. The coilover system included with the package was developed specifically for the 991.1 platform, which means geometry, ride height, and damping are all engineered with Porsche’s performance DNA in mind. This precision allows the chassis to operate at a level of sharpness and consistency that the stock setup cannot match.
The real advantage comes when the car is pushed hard. With Manthey’s coilovers installed, the GT3 RS feels more composed under heavy braking, more predictable in mid-corner balance, and far more confident during high-speed direction changes. The system doesn’t compromise comfort, either, which makes it just as capable on a spirited backroad drive as it is at full attack on the Nürburgring. Drivers will notice an immediate improvement in steering feedback and confidence, which is exactly what Manthey intended.
Braking is one of the most overlooked yet critical aspects of performance, and Manthey Racing addressed this with reinforced front and rear brake lines. These braided lines are built to withstand higher temperatures and pressures than the factory equipment, which translates into more consistent stopping power under repeated hard use.
For the driver, this means a firmer pedal feel and better modulation during trail braking into corners. On a demanding track day where laps are strung together with little cooldown, these improvements prevent brake fade and give the GT3 RS the reliability needed to keep pushing. It’s not just about durability, though. The upgrade enhances confidence in every braking zone, allowing drivers to attack later and carry more speed with the reassurance that the system will respond precisely.
Manthey Racing also added aerodynamic refinements that shift the car’s performance envelope in meaningful ways. The front bumper canards generate additional downforce at the nose, keeping the car pinned during aggressive corner entry. At the rear, a gurney flap improves the efficiency of the wing, helping stabilize the GT3 RS at higher speeds. Combined with the redesigned underside cover and integrated diffuser, airflow is managed more cleanly across the car’s profile.
These changes are subtle but effective. Rather than dramatically altering the Porsche’s silhouette, Manthey focused on functionality, ensuring that every addition contributes to the car’s balance and agility. On track, the improvements are most noticeable in quick transitions and high-speed sweepers, where stability and precision are paramount. The car feels less unsettled when pushed to its limits, which makes it easier to drive consistently fast laps.
The Manthey Kit isn’t about overwhelming the GT3 RS with excessive parts; it’s about carefully curated upgrades that deliver measurable gains. The package includes the coilover suspension system, front and rear braided brake lines, front bumper canards, a gurney flap, and an underside cover with rear diffuser.
Each component was designed to integrate seamlessly with Porsche’s engineering. This ensures perfect fitment, preserves the GT3 RS’s OEM reliability, and avoids the compromises often found in aftermarket modifications. The result is a car that feels factory-developed yet significantly sharper in performance.
Manthey Racing GmbH has been shaping Porsche’s motorsport reputation for decades. With more than 250 employees and a proven track record in the Nürburgring VLN Endurance Championship and the FIA World Endurance Championship, the company has established itself as one of the most trusted names in racing. Their partnership with Porsche Motorsport, which began in 2013, speaks volumes about the level of confidence Porsche places in Manthey’s engineering expertise.
But Manthey is not limited to professional racing alone. The company has a strong presence in enthusiast circles, preparing street-legal cars for track use with the same precision applied to factory-backed race programs. The Cayman GT4 Trophy, which they successfully organized at the Nürburgring, highlights this dual focus on competition and enthusiast enjoyment. With Porsche AG holding a majority stake in the company, Manthey’s position at the forefront of performance development is secure.
The Manthey Racing Manthey Kit for the 991.1 Porsche 911 GT3 RS is available now through Bulletproof Automotive. For drivers looking to push their GT3 RS into true motorsport territory, this package offers a proven path backed by Manthey’s decades of racing success. It is a complete solution for those who demand precision, performance, and integration at the highest level.
