The Manthey Effect: what a Manthey Kit does to a Porsche, and its value
Manthey has been building race cars for decades and, from its base at the Nürburgring, runs one of the most successful teams in endurance racing, with numerous victories at the 24 Hours of the Nordschleife. The company translates that knowledge to the road via the Manthey Kit: a package of suspension and aerodynamic upgrades that makes a street-legal Porsche sharper, more stable, and faster, without stripping the car of its daily usability. The result is not traditional tuning, but Porsche-approved engineering that comes straight from the world of racing.
Why would you opt for a Manthey Kit?
Since 2013, Manthey has been 51 percent owned by Porsche. That connection gives the company a unique position within the automotive world. Where the Sonderwunsch and Paint to Sample programs focus on personalization, and the Weissach Package adds extra track-oriented engineering directly from Porsche, Manthey chooses a different approach. The company transforms an already delivered Porsche into a purely performance-oriented driver's car, inspired by the experience gained on the Nordschleife.
Development takes place on the Nordschleife itself. Components are tested, refined, and coordinated under real-world loads. That is also the essential difference compared to tuning parts sold individually: damper characteristics, spring rates, and stabilizer bars are revised to work with the additionally created downforce, not alongside it.
Historically, there are few comparable examples. AMG before its full integration into Mercedes and Alpina at BMW come closest. Like them, Manthey combines the independence and expertise of a specialized developer with the manufacturer's official recognition, without losing its own technical identity. Recent applications on the 911 GT3 RS and the Taycan Turbo GT show how far that concept can reach.
What do you actually get?
The composition varies by model, but the structure is always the same and consists of two halves that need each other.
On the aerodynamic side: a modified rear wing, additional elements on the front bumper, closed or ventilated wheel arch panels, and adjustments to the underbody. Together, these generate significantly more downward pressure, especially at higher speeds.
On the suspension side: adjustable coilover dampers, modified springs and stabilizer bars, and a revised geometry setup. Without that second half, the extra downforce would only make the car heavier and slower. That is exactly why Manthey sells the kit as a complete set rather than as individual parts.
Market perception and reality
A full Manthey Kit on a GT3 represents an investment of approximately 56,000 euros including installation, at 2026 price levels. We are therefore not talking about a collection of loose parts, but an integrated whole.
In the second-hand market, this divides buyers into two camps. On one hand, there is caution: many assume that a Manthey Porsche has been driven intensively on the track, which increases the perception of wear, regardless of the mileage. On the other hand, informed buyers recognize the quality. The Manthey Kit is technically among the best that exists and appeals to a specific, enthusiastic audience. That market exists and will continue to exist, even if it is inherently selective.
The impact on residual value is therefore situational. Two factors determine whether a Manthey specification yields a higher or lower price: transparency regarding track use and the right buyer at the right time.
The Manthey Kit is therefore not for the average Porsche driver. It targets a small group of enthusiasts who feel that even a standard GT3 RS does not go far enough. For them, Manthey is the logical next step: no extra luxury, no flashy personalization, but a package entirely dedicated to grip and driving precision.
What clocks are ticking on the Nordschleife
That makes Manthey special in a rapidly changing sector. While manufacturers increasingly choose hybrid and electric powertrains, the company continues to push the boundaries of classic GT technology. The figures support that.
The benchmark remains the 911 GT2 RS with Manthey Kit, which set a 6:43.300 in June 2021 with Lars Kern at the wheel. At the time, that was the fastest lap ever by a street-legal production car, until the Mercedes-AMG One surpassed it in November 2022 with a 6:29.090. The GT2 RS thus remains the fastest street-legal Porsche ever to lap the Nordschleife.
More recently, the 992.1 GT3 RS with Manthey Kit dipped below seven minutes: on April 17, 2026, Jörg Bergmeister drove a 6:45.389. Just over a second and a half off the GT2 RS, with a car that has hundreds of horsepower less.
And with the kit for the Taycan Turbo GT, Manthey proves that the philosophy does not stop at the internal combustion engine. The technical challenges are different, but the goal remains identical: faster, sharper, more extreme. Lars Kern clocked 6:55.533, a class record for electric cars. The most telling comparison is with itself: in October 2023, he drove a Taycan Turbo GT with Weissach Package around the exact same lap in 7:07.55. Twelve seconds of difference, thanks entirely to the kit.
For which Porsches is the Manthey Kit available?
The Manthey Kit is available for the Taycan Turbo GT, 911 GT3 RS (992.1, 991.2 and 991.1), 911 GT3 (992.2, 992.1 and 991.2), 911 GT3 Touring (992.1), 911 GT2 RS (991.2), 718 Cayman GT4 RS (982) and 718 Cayman GT4 (982 and 981).
Our thoughts
"A Manthey Kit does not automatically add value to a Porsche. What it does do is change the pool of potential buyers." Simon, Classics & Capital
A Manthey Kit is not a recipe for increasing the market value of a Porsche. What it does is shift the target group. The car no longer appeals to the broad group of Porsche buyers, but to a smaller circle of highly engaged enthusiasts who understand exactly what the upgrades mean. The market becomes smaller, but more focused.
For those selling, it means patience and documentation. For those buying and driving, it means something else: a car that is at its best in the place where it was developed. That doesn't necessarily make a Manthey Porsche worth more, but it does make it significantly more exclusive.
The full story
In edition 01, "The Manthey Effect" is a full chapter, with all the images and the complete market analysis. Along with eight other Porsches, each viewed through the same independent lens.
Order edition 01: The Porsche Edition
Frequently asked questions
Does a Manthey Kit add value to a Porsche?
Not automatically. A Manthey Kit is not a guaranteed recipe for increasing market value. What it does is change the target group: from the broad group of Porsche buyers to a smaller circle of enthusiasts who understand and appreciate the upgrades. That does not necessarily make a Manthey Porsche worth more, but it does make it more exclusive.
What does a Manthey Kit cost?
A full kit on a GT3 represents an investment of approximately 56,000 euros including installation, at 2026 price levels.
For which Porsches is the Manthey Kit available?
For the Taycan Turbo GT, 911 GT3 RS (992.1, 991.2, 991.1), 911 GT3 (992.2, 992.1, 991.2), 911 GT3 Touring (992.1), 911 GT2 RS (991.2), 718 Cayman GT4 RS (982) and 718 Cayman GT4 (982 and 981).
Is Manthey part of Porsche?
Since 2013, Manthey has been 51 percent owned by Porsche. The company is based at the Nürburgring and runs one of the most successful teams in endurance racing, with numerous victories at the 24 Hours of the Nordschleife.
Does a Manthey Kit make a Porsche faster?
Yes, and measurably so. A 911 GT2 RS with Manthey Kit set a 6:43.300 on the Nordschleife in June 2021, still the fastest time ever by a street-legal Porsche. A 992.1 GT3 RS with the kit clocked a 6:45.389 in April 2026. The Taycan Turbo GT with Manthey Kit went twelve seconds faster than the same car with the Weissach Package over the same lap, with a time of 6:55.533.
Why do some Porsche owners not buy a Manthey model?
In the second-hand market, some buyers are cautious: they assume that a Manthey Porsche has been driven intensively on the track, which increases the perception of wear, regardless of the actual mileage.
