Theon Design's 421-HP 911: A Lightweight Masterpiece

The British restomod specialist has revealed its latest custom Porsche 911 build, a lightweight carbon-bodied 964 coupe combining the marque’s classic air-cooled character with modern engineering and 421 horsepower. Theon Design thinks there can never be too many custom 911 builds aimed at millionaire car lovers.

Built as a commission for a private client and tailored to their specific preferences, the latest Theon model draws power from a naturally aspirated 4.0-liter flat-six producing 421 hp and 324 lb-ft of torque.

The vehicle weighs just 2,527 pounds, thanks in part to an extensive carbon-fiber body. Despite the use of modern lightweight materials, Theon continues to retain steel doors on all of its builds, arguing it preserves the familiar feel and tactility of a classic 911.

The car is finished in a Crayon Grey paintjob with Lizard Green accents, while sporting smoked lighting elements, custom brushed brightwork, and a Turbonite Porsche crest.

Underneath, the car features TracTive semi-active suspension with five selectable settings, which allows the ride and handling nature to be adjusted from a daily driving style to full-on track use. And a front-axle lift system helps getting in and out of driveways easier.

Engine management is handled through a MoTeC ECU and power distribution system. The drive-by-wire throttle has multiple settings from Town and Race modes to a “Raucus” that unlocks full performance, deploys the rear spoiler, and activates a louder exhaust note complete with pops and crackles.

The color themes extend inside with dark leather trim surfaces and Lizard Green stitching. Recaro RS seats, bespoke aluminum footboards, and custom-machined vents, door handles and dashboard details reinforce the handcrafted feel.

Theon Design produces a limited number of air-cooled Porsche 911 commissions each year, with only six new builds scheduled for delivery worldwide in 2026.