Theon Design’s 964 911 Has A Better Power-To-Weight Ratio Than A Modern 911 GT3 RS

Singer Vehicle Design may be known as the go-to company in the world of Porsche 911 restomods, but it isn’t the only leading name in town. Another is the UK’s Theon Design, which, like Singer, specializes in turning the 964-generation Porsche 911 into pieces of automotive art. Theon Design’s latest project is its most ambitious yet.

Shown here is a 911 restomod commissioned by a buyer in the US. It’s the lightest and most powerful 911 that Theon Design has ever built, and according to the company, the power-to-weight ratio is superior to that of the current 992-generation 911 GT3 RS.

F1-Grade Carbon-Kevlar Construction

The curb weight is an impressively low 2,535 pounds, and with the engine spitting out 421 horsepower, there’s only about six pounds to carry for every pony. The GT3 RS is only slightly off at around 6.2 pounds per horsepower. Achieving such a low weight is possible thanks to the use of body panels made from Formula 1-grade carbon fiber and Kevlar. Only the doors remain steel.

So meticulous are Theon’s weight-saving measures that even the standard wiring loom is replaced with a more efficient design that helps save around 66 pounds. Other measures include removing the rear seat, swapping the front seats with lightweight Recaros, and adding carbon-ceramic brake rotors.

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For the interior, the customer chose hand-trimmed Fresca blue and Picasso ivory leather to hide what would normally be carbon surfaces. Other highlights include billet aluminum touchpoints, jewel-like custom gauges, and a tailored audiophile-grade sound system with a hidden Alpine head unit. On the outside, the customer’s color of choice is Azzurro Thetys Metallic. That’s a fancy way of saying a very light, pale blue.

Like with all Theon builds, the donor 911 was first stripped to bare metal and then rebuilt to what the company describes as better than OEM standards. This includes making additional welds to improve torsional rigidity and structural strength.

Naturally Aspirated And Air-Cooled

The engine is a 4.0-liter flat-6 derived from the 3.6-liter engine found in the 964 911, rated at 421 hp and 330 lb-ft of torque, and married to a six-speed manual transmission with a Torsen limited-slip differential. The engine also features Theon’s own velocity stacks, as well as bespoke independent throttle bodies developed by a company called Jenvey.

A single plug connecting all wiring to the bulkhead makes removal of the engine for maintenance a breeze. Theon also moved ancillaries like the AC compressor and power steering pump to the front of the car to help improve the front-to-rear weight ratio, which stands at 46:54 – an impressive figure for a rear-engined car. Theon also installed an adjustable exhaust that enables a muted sound for around-town or early-morning starts.

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The suspension is a semi-active setup from TracTive and includes five different settings. Attached at each hub is an 18-inch wheel with the classic Fuchs pattern and Michelin Pilot Sport 4 rubber. The carbon-ceramic brake rotors are Theon’s own design. They feature Brembo monobloc calipers and measure 14 inches in diameter front and rear.

Buyers Should Be Prepared To Wait

Pricing for one of Theon Design’s 911 restomods starts at $590,000, though that figure excludes the cost of the donor car as well as any transport costs. The company said its cars are unaffected by current US tariffs on cars and car parts.

As every Theon build is a custom project, the specifications are determined over a lengthy consultation period. Only then does the build process begin. According to the company, the whole process lasts around 18 months.

Source: Theon Design