Theon Design Porsche 911 has been revealed in its latest bespoke form, built for a British customer and finished in striking Ice Green Metallic. This hand-crafted coupe showcases the highest specific output flat-six yet from Theon, producing 407bhp from a naturally aspirated 3.8-litre engine. With its blend of advanced engineering and traditional craftsmanship, the commission shows how a classic air-cooled 911 can be reimagined for modern British roads.
Air-Cooled Flat-Six with Record Output
At the heart of this Porsche 911 is a 3.8-litre flat-six that revs to 7,600rpm. It generates 407bhp and 293lb/ft of torque, achieving 107bhp per litre, Theon’s strongest figure to date. The engine features drive-by-wire throttle, independent throttle bodies, and switchable mapping with four modes, ranging from a relaxed Town setup to a full Race mode.
The exhaust can be adjusted to run quietly or deliver the flat-six’s full soundtrack, while power is sent to the rear wheels through a five-speed manual gearbox. At just 1150kg, the coupe offers sharp performance and mechanical engagement that nods to Porsche’s analog heritage.
Motorsport Valley Engineering
Theon Design operates from Oxfordshire in the UK’s Motorsport Valley, home to world-leading race engineering. Starting with a 964-generation 911 donor, the car is stripped, 3D scanned, seam welded, and rebuilt with a reinforced shell. The new body is crafted in lightweight carbon-kevlar, combining aerospace composites and motorsport know-how.
This commission introduces new design details for Theon, including body-coloured mirrors and headlight rings, ghost stripes, and Eclipse Chrome brightwork. The 18-inch Fuchs-style split rims complete the stance, matched with Michelin Pilot Sport tyres.
Adaptive Chassis and Brakes
The chassis features a semi-active TracTive damping system, calibrated for British roads. It offers five-stage adjustability, switching between comfort and precise control at the touch of a button. Braking is handled by Porsche 993 RS hardware with red callipers, giving the coupe stopping power equal to its performance.
Handcrafted Interior Details
Inside, the cabin is finished with carbon fibre and Phantom black leather, accented by Ice Green stitching. Recaro CS seats with carbon backs provide comfort and support, while new sculpted door cards add texture. Theon’s Aluminium Pack replaces plastic controls with machined billet pieces, finished in champagne tones for a tactile, authentic feel.
A modern gauge cluster with needle sweep, wireless charging, and discreet Alpine audio with Focal speakers ensure daily usability. The balance between heritage and convenience is central to the build.
Power and Performance Summary
This Theon Design Porsche 911 delivers 407bhp from its naturally aspirated 3.8-litre flat-six, paired with 293lb/ft of torque and a weight of 1150kg. It accelerates with urgency, while adaptive dampers and switchable engine mapping allow it to move between relaxed touring and aggressive, GT3-inspired driving character.
Summary
Theon Design’s latest Porsche 911 commission highlights how bespoke craftsmanship can merge with advanced British motorsport technology. With its 407bhp flat-six, carbon-kevlar body, and adaptive chassis, it captures the essence of a classic 911 while tailoring it for today’s roads.
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Source: Theon Design
