Theon Design Unveils 421 HP Porsche 911 Restomod With Better Power to Weight Ratio Than a GT3
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British restomod specialist Theon Design has revealed its latest air cooled Porsche 911 creation, and it is aimed at buyers who want classic 911 character with modern engineering underneath.
Based on the Porsche 964 generation 911 Coupe, the latest commission combines a lightweight carbon fiber body, a naturally aspirated 4.0 litre flat six engine, and a six speed manual gearbox. The result is a highly focused driver’s car with a claimed power to weight ratio that even surpasses the current Porsche 911 GT3 (992.2).
Lightweight Carbon Body Keeps Weight Down
One of the biggest highlights of this build is its extensive use of carbon fiber.
Theon Design has fitted a carbon fiber body while retaining steel doors. According to the company, keeping the steel doors helps preserve the familiar feel and tactile experience of a classic Porsche 911.
The restomod weighs just 2,527 pounds (around 1,146 kg), making it significantly lighter than many modern performance cars.
4.0 Litre Flat Six Produces 421 HP
Power comes from a naturally aspirated 4.0 litre flat six engine that delivers:
| Model | Power | Torque |
|---|---|---|
| M3 CS Handschalter | 473 hp | 406 lb-ft |
| M3 CS xDrive | 543 hp | 479 lb-ft |
The engine is paired with a six speed manual transmission and rear wheel drive, staying true to the traditional sports car formula that enthusiasts love.
Thanks to its low weight and healthy power output, Theon claims the car achieves a power to weight ratio superior to the latest 992.2 generation Porsche 911 GT3.
Exterior Features
The featured commission wears Crayon Grey paint combined with Lizard Green accents.
Other exterior highlights include:
- Smoked lighting elements
- Custom brushed brightwork
- Turbonite Porsche crest
- 17 inch wheels
- Green RS brake calipers
The overall design stays faithful to the original 964 shape while adding subtle modern touches.
Adjustable Suspension For Road And Track
Theon Design has equipped the car with TracTive semi active suspension.
Drivers can choose between five different suspension settings, allowing the car to switch from comfortable road use to more aggressive track focused driving.
The car also features a front axle lift system, making it easier to clear speed bumps, ramps, and steep driveways.
Advanced Electronics And Drive Modes
Despite its classic appearance, modern technology plays a major role beneath the surface.
The car uses a MoTeC ECU and power distribution system to manage engine functions and vehicle electronics.
Its drive by wire throttle offers multiple driving modes, including:
- Town
- Race
- Raucous
The Raucous mode unlocks maximum performance, deploys the rear spoiler, and activates a louder exhaust note complete with pops and crackles.
Handcrafted Interior With Modern Conveniences
Inside, the cabin continues the green themed design with dark leather upholstery and Lizard Green stitching.
Key interior features include:
- Recaro RS seats
- Bespoke aluminium footboards
- Custom machined air vents
- Special door handles
- Unique dashboard details
Modern convenience features have also been added without disturbing the classic look.
These include:
- Wireless phone charging
- Upgraded audio system
- Becker Mexico style head unit appearance
This approach allows owners to enjoy modern functionality while maintaining a period correct cabin design.
Only Six Cars Planned For 2026
Theon Design was founded by Adam Hawley and operates from Oxfordshire, England.
The company builds only a small number of air cooled Porsche 911 commissions every year. According to Theon, each project requires approximately 6,000 hours of development and assembly work.
Production will remain extremely limited, with just six new customer commissions scheduled for delivery worldwide in 2026.
Pricing starts at $585,000 before the donor vehicle, shipping costs, and local taxes, meaning final ownership costs can easily exceed $600,000 depending on specifications and location.
Final Thoughts
The latest Theon Design 911 restomod blends classic Porsche 964 styling with modern engineering, lightweight construction, and a naturally aspirated 421 HP flat six engine. With a six speed manual gearbox, advanced suspension technology, and a claimed GT3 beating power to weight ratio, it represents a modern interpretation of the air cooled Porsche 911 while remaining faithful to its roots.
Sources & References
Official Source
- Theon Design Official Website
Official website of Theon Design. Contains company information, commission details, technical specifications, and project galleries.
Industry Publications
- Autoweek Coverage of the 421 HP Theon 911
Detailed report covering the new 421 HP Theon Design Porsche 911, including performance figures, weight, pricing, and production details. - MotorTrend Theon Design 911 Review
First drive review from a major US automotive publication, offering insights into Theon Design’s engineering and driving experience. - Top Gear Theon Design 4.0 Coupe Review
Comprehensive review discussing performance, pricing, and Theon Design’s approach to Porsche restomods. - Forbes Feature on Theon Design’s Most Powerful 911
Covers Theon Design’s lightweight, high performance Porsche builds and their growing presence among US collectors.
Additional Reference
- GearJunkie Theon Design USA001 Review
Real world review of a US customer commissioned Theon Design Porsche 911 restomod.
Theon Design Porsche 911 Restomod FAQ
What is the new Theon Design Porsche 911 restomod?
The latest Theon Design build is a custom air cooled Porsche 911 restomod based on the 964 generation Coupe. It combines classic Porsche styling with modern engineering, lightweight materials, and a naturally aspirated 4.0 litre flat six engine.
How much power does the Theon Design 911 produce?
The car produces 421 HP and 324 lb ft of torque from its naturally aspirated 4.0 litre flat six engine.
What transmission does the Theon Design 911 use?
The restomod comes equipped with a six speed manual transmission and sends power to the rear wheels.
How much does the Theon Design Porsche 911 weigh?
The vehicle has a claimed weight of just 2,527 pounds (1,146 kg), thanks largely to its extensive carbon fiber body construction.
Why does Theon Design keep steel doors on its builds?
Although the body uses lightweight carbon fiber panels, Theon Design retains steel doors because the company believes they preserve the familiar feel and tactile experience of a classic Porsche 911.
Does the Theon Design 911 have a better power to weight ratio than the Porsche 911 GT3?
According to Theon Design, this 421 HP restomod achieves a power to weight ratio that surpasses the current Porsche 911 GT3 (992.2).
What suspension system does the Theon Design 911 use?
The car features TracTive semi active suspension with five selectable settings, allowing drivers to adjust the vehicle from comfortable road driving to more focused track use.
What drive modes are available?
The drive by wire throttle system offers Town, Race, and Raucous modes. Raucous mode unlocks maximum performance, deploys the rear spoiler, and activates a louder exhaust note.
What modern features are included inside the cabin?
The interior includes wireless phone charging, an upgraded audio system, Recaro RS seats, bespoke aluminium footboards, and a Becker Mexico style head unit appearance that maintains the classic look.
How many Theon Design 911 commissions will be built in 2026?
The company plans to deliver only six customer commissions worldwide during 2026, making the car highly exclusive.
How much does the Theon Design Porsche 911 restomod cost?
Pricing starts at $585,000 before the donor vehicle, shipping costs, and local taxes. Final pricing can exceed $600,000 depending on specifications and location.
