For a Porsche that regularly sees track days, a Manthey Kit can be worth considering; for a road-first car or occasional circuit use, its high purchase and fitting cost is difficult to justify. These model-specific, track-focused upgrades are developed with Porsche to add aerodynamic load and chassis capability. Their lap-time headlines are manufacturer demonstrations, not a prediction of what every owner will gain.
What a Manthey Kit changes
Manthey Kits are not one interchangeable package: the parts and performance claims differ by model. Porsche describes them as track-oriented upgrades developed with its engineers, and the practical value depends on the car, circuit, setup and driver.
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992.2 911 GT3
The kit revises underbody and body aerodynamics, including the underbody turning vanes, front splitter, diffuser and rear wing. It also adds four-way adjustable coilover suspension and braided steel brake lines; racing brake pads and lightweight wheels are optional. Porsche reports 355 kg of downforce at 285 km/h in road mode and 540 kg at that speed in circuit mode. Those are manufacturer figures for the stated speed and setup—not a measure of typical road performance. Circuit mode is for track use and must not be used on public roads. Porsche Newsroom
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Porsche’s kit revises the aerodynamics, adds adjustable coilovers and increased front spring rates, and includes steel brake lines. In the track-wing setting, Porsche says downforce at approximately 124 mph rises from 196 lb to 372 lb. A carbon-fiber add-on package and track tow loops were also identified in the US announcement. Porsche Cars North America
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This kit is a broader powertrain, suspension and aerodynamic package. Porsche says it revises the battery, control unit and pulse inverters, raises system output to 600 kW from 580 kW standard, and offers an Attack Mode boost of up to 130 kW for a short duration. At 200 km/h, its claimed downforce rises from 95 kg to 310 kg. These figures apply to this exact model and package. Porsche Newsroom
How much faster is a Manthey-equipped Porsche?
Porsche’s lap times show what these cars have achieved in specific manufacturer test runs; they do not isolate a guaranteed kit-only gain for customers. Drivers, tires, weather, setup and circuit conditions all affect lap times.
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| Car and test | Reported result | What the comparison means |
|---|---|---|
| 992.2 911 GT3 with Manthey Kit, Nordschleife, 2025 | 6:52.981 on the 20.8-km circuit | Porsche said it was 2.76 seconds quicker than the 992.1 GT3 with Manthey Kit. Ayhancan Güven drove; a notary certified the time. Both cars used optional Michelin Pilot Sport Cup 2 R tires. Porsche said the 2025 track was damp and slippery in places and that it planned another attempt in better weather. Porsche Newsroom |
| 718 Cayman GT4 RS with Manthey Kit, 2024 | 7:03.121 | Porsche Cars North America reported a lap by Jörg Bergmeister that was more than six seconds quicker than the standard car’s previous-year time. The lap-time comparison and aero figures refer to a specified track setup. Porsche Cars North America |
| Taycan Turbo GT with Weissach Package and Manthey Kit | 6:55.533 on the Nordschleife | Porsche reported that Lars Kern drove the notary-certified lap, 12 seconds quicker than the company’s previous lap in a Taycan Turbo GT with Weissach Package and over nine seconds ahead of the prior electric executive-car record. These are manufacturer test comparisons, not ordinary owner results. Porsche Newsroom |
Why circuit and driver matter
More downforce and firmer control are not equally useful everywhere. In its assessment of the 992 GT3 RS, evo questioned how much of the kit’s uplift could be isolated at smooth Monza, where the standard car was already planted, and saw more scope for the changes to matter on bumpy, high-speed circuits such as the Nürburgring. Its separate track testing also notes that tires, setup and driver confidence shape the result. That is why a headline lap time is weak evidence for an individual owner’s likely gain.
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What does a Manthey Kit cost?
There is no single current price that applies to every kit, country or eligible car. The figures below are market- and date-specific reference points; ask an authorized Porsche Centre for a current quote covering the exact model, parts and installation.
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| Kit | Reported price | Important qualification |
|---|---|---|
| 992.2 911 GT3, UK | £56,000, plus fitting | Reported by evo in 2026; the kit requires a 992.2 GT3. evo |
| 718 Cayman GT4 RS, US | $53,946 MSRP, excluding installation | Price listed by Porsche Cars North America when it announced US ordering in 2024; it is historical, not a current quote. Its separately listed carbon-fiber add-on package was $5,890. Porsche Cars North America |
A £280,517 “as-tested” total in a PistonHeads account of a UK 992.2 GT3 includes the car and numerous other options and parts; it is not the kit price.
Installation, servicing and warranty
For the 992.2 GT3, evo reports that qualified Porsche Centres install and service the kit, whose parts carry Porsche numbers and a factory warranty. Porsche stated in its 2025 GT3 announcement that the factory warranty remains fully intact. Neither statement establishes a universal warranty rule for every kit, model and country: get the terms in writing for the specific car and market before purchase. evo Porsche Newsroom
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When is the kit worth it?
The case is strongest when the owner has an eligible car, attends track days regularly, and drives circuits where aerodynamic load and suspension control can be used. It also helps if Porsche Centre installation and support are part of the value the owner wants. This is a decision framework, not a measured cost-per-lap calculation.
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- Match the circuit: Consider whether your usual tracks reward high-speed downforce and chassis control, rather than assuming every circuit will reveal the same benefit.
- Budget for the whole activity: Compare the installed kit cost with tires, consumables, maintenance, instruction and track fees. Porsche’s GT3 comparison, for example, used optional Michelin Pilot Sport Cup 2 R tires; verify tire size, rating, fitment, availability and suitability for your car and use.
- Account for the base car: A highly capable Porsche may already feel planted and fast. Independent testing suggests the improvement can be harder to discern on a smooth circuit than on a bumpy, high-speed one.
- Confirm model and market: Check eligibility, availability, installation, servicing and written warranty terms with an authorized Porsche channel in your country.
- Separate road from circuit use: The GT3’s circuit-mode setup is not for public roads. Check how each kit’s settings and equipment fit your intended use.
If track use is rare, you are still building driving fundamentals, or the total cost would displace instruction, seat time, maintenance or suitable tires, those are more defensible priorities. A lap record cannot show that the kit will repay its cost for your driving.
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