Theon Design has unveiled a new 419-bhp Porsche 911 restomod based on the 964 generation, marking the British specialist’s 10th anniversary. The carbon-fiber-bodied Coupe weighs just 1,150 kg (2,535 pounds) and features a naturally aspirated 4.0-liter flat-six, a five-speed manual transmission and suspension developed specifically for British roads.
The Oxfordshire-based company also confirmed that its first customer Theon R is under construction, introduced an online configurator and announced new North American customer support. Theon Design Coupe commissions start at £435,000, excluding the donor Porsche, shipping and local taxes, with each build taking approximately 18 months.
419-BHP Air-Cooled Flat-Six and Carbon-Fiber Bodywork
The latest commission began with a 35-year-old Porsche 964 stripped to its bare shell for restoration and mechanical upgrades. Developed over 18 months for a UK customer, the car features carbon-fiber exterior panels, bumpers, lower sills and interior trim, contributing to an estimated 300 kg weight reduction.
Its 4.0-liter air-cooled flat-six produces 419 bhp and 322 lb-ft of torque, driving the rear wheels through a G50 five-speed manual gearbox. Theon quotes approximately 4.0 seconds for the 0–60 mph sprint, while selectable engine maps, drive-by-wire throttle control and a dedicated town mode allow the driver to adjust engine response.
Porsche 993 RS Brakes and TracTive Suspension
The chassis combines TracTive semi-active dampers, bespoke spring rates and individually calibrated steering. Seventeen-inch wheels wearing Michelin Pilot Sport tires provide additional sidewall compliance, while Porsche 993 RS brake discs and calipers handle stopping duties.
Finished in Oak Green Neo Metallic with champagne-colored Porsche lettering and wheel detailing, the Coupe features a Beechwood leather and nubuck interior with Recaro CS seats. Upgrades include an electric heating and air-conditioning system, aluminum window switches and a lightweight MIL-spec wiring loom that saves approximately 25 kg.
Theon R Targets More Than 500 BHP
Theon also confirmed that its first customer Theon R has entered production. The forthcoming model is being developed around a high-revving 4.0-liter flat-six producing more than 500 bhp, motorsport-derived chassis technology and a targeted curb weight below 1,000 kg.
The company has launched an online configurator covering its Coupe, Targa and R models. It has also partnered with Humble House to provide concierge support for North American customers.
Constantly Moving Forward
Founded in 2016 by Adam Hawley and Lucinda Argy, Theon Design has spent a decade refining its interpretation of the air-cooled 911. The latest Coupe demonstrates how the 964 platform can combine substantially increased performance with manual-transmission engagement and road-focused suspension tuning, while the lighter, more powerful Theon R signals the company’s next engineering direction.
Specification Highlights
| Vehicle | Theon Design Porsche 964 Coupe |
| Engine | 4.0-liter air-cooled flat-six |
| Output | 419 bhp / 322 lb-ft |
| Transmission | Five-speed G50 manual |
| Weight | 1,150 kg |
| 0–60 mph | Approximately 4.0 seconds |
| Starting price | £435,000, excluding donor car, shipping and taxes |
| Build time | 18 months |
| Theon R targets | Over 500 bhp; under 1,000 kg |
Online Configurator
Above contents © 2026 Thon Design Ltd. reviewed and edited by Rex McAfee , @rexmcafee 🏁
