Theon Design Marks 10 Years with 419hp Porsche 911 Restomod

British specialist Theon Design has unveiled its latest Porsche 911 (964 Gen) restomod as it celebrates ten years of building bespoke air-cooled 911s. Developed over 18 months with a UK-based customer, the commission combines classic Porsche styling with extensive engineering upgrades and a 419hp naturally aspirated flat-six.

Finished in Oak Green Neo Metallic, the car retains the familiar 964 silhouette but gets extensive carbon-fibre bodywork and carefully chosen details. The finished build weighs 1,150kg, making it a lightweight, performance-focused machine designed specifically for British roads.

A Bespoke Air-Cooled Flat-Six

Power comes from a naturally aspirated 4.0-litre air-cooled flat-six producing 419bhp and 436Nm of torque. It sends power to the rear wheels through a five-speed G50 manual gearbox. The car can accelerate from 0-100 kmph in approximately four seconds.

Key mechanical upgrades include:

• Selectable engine maps, including a dedicated town mode
• Drive-by-wire throttle system
• TracTive semi-active dampers
• Bespoke spring rates and steering calibration
• Porsche 993 RS brakes
• 17-inch wheels with Michelin Pilot Sport tyres

The suspension setup has been tailored to offer sharp handling without compromising comfort on uneven roads.

Classic Cabin, Modern Engineering

The interior features Beechnut semi-aniline and nubuck leather, champagne detailing and Recaro CS seats. The original 964 cockpit layout has largely been retained, with improvements to materials and controls.

Theon has also replaced the original heating system with fully electric heating and air conditioning. A new lightweight wiring loom saves approximately 25kg, while the carbon-fibre bodywork contributes to the car’s reduced weight.

Also read: https://fly-wheel.com/honda-to-bring-its-first-all-electric-suv-to-india-as-honda-alpha/

Final Take

Theon Design’s latest commission shows how far a classic 911 can be developed without losing its original character. With prices starting at £435,000 (₹5,41,95,084) for a Coupe, excluding the donor car, each build takes around 18 months and is tailored to its owner’s preferences.