Theon’s latest commission starts as a 35-year-old Porsche 911 (964), gets stripped to a bare shell, and comes back wearing an entirely carbon fiber body. It weighs 2,535 lb. The silhouette barely changes.
Oak Green Neo Metallic does the talking on the surface, an evolution of Porsche’s classic Oak Green with champagne script and champagne wheels. Underneath sits a 4.0-liter air-cooled flat-six making 419 hp, driving the rear wheels through a five-speed manual gearbox the client specified himself, on a car built for British back roads.
Carbon fiber under a familiar silhouette
The bodywork, bumpers and lower sill panels are F1-grade carbon fiber from a composites supplier that works exclusively for Theon, and the interior trim panels are carbon too.
Each donor car is stripped to a bare shell, then restored and re-engineered piece by piece so a 35-year-old structure can carry the upgraded powertrain and chassis. The workshop sits in Oxfordshire, in the middle of the UK’s Motorsport Valley.
Theon quotes a saving of about 661 lb (300 kg) against the steel-bodied car, the biggest single cut in the build.
The shape takes its cues from Porsche’s early RS and ST cars, right down to machined aluminum mirrors in the style of the 991 Speedster concept. The finished coupe weighs 2,535 lb (1,150 kg) while looking like a well-kept original.
The tradeoff cuts both ways: the original steel panels are gone for good, though every carbon panel follows the 964’s scanned shape closely enough that the eye goes looking for the difference.
The restraint is deliberate.
A 4.0-liter flat-six and a gearbox picked for the long way home
The engine is Porsche’s air-cooled flat-six at 4.0 liters, naturally aspirated, making 419 hp and 322 lb-ft of torque, with the sharp throttle response a decade of Theon development has been refining, with its mechanical character intact.
Drive-by-wire brings selectable maps, including a town mode.
The client picked the five-speed G50 manual over Theon’s closer-stacked 993 RS-spec six-speed, trading ratio steps for long-distance calm.
Theon quotes 0 to 60 mph in about 4.0 seconds, with 993 RS brakes handling the stopping.
Power runs to the rear wheels only.
Four seconds, no turbos, no paddles.
Semi-active dampers tuned for broken British roads
TracTive semi-active dampers and bespoke spring rates sit under the car, calibrated for the balance of handling and ride comfort this client asked for, with an individually tuned steering package alongside.
The 17-inch wheels wear Michelin Pilot Sport tires, and the taller sidewalls add compliance where the surface falls apart, which on British back roads is most of it.
The brief was body control and sharp turn-in that still soaks up broken tarmac.
Sharp turn-in, soft landings.
Beechwood and nubuck, with heat that doesn’t wait for the engine
The cabin is trimmed in Beechwood semi-aniline and nubuck leather with champagne details that echo the exterior, and Recaro CS seats split the difference between long-distance comfort and real support.
The 964’s cockpit architecture stays put, five-dial dash and all, but the window switches are now milled from aluminum.
A fully electric heating and air-conditioning system replaces the original heat exchangers, so warmth arrives on a cold morning without waiting for the engine to warm up, and the swap drops complexity along with about 4 to 7 lb.
Hidden below the trim, a lightweight MIL-spec wiring loom replaces the bulky original harness and saves about 55 lb (25 kg) on its own, part of the same subtraction program as the climate system.
The luxury here is subtraction.
Ten years in, restraint is still the house style
Adam Hawley founded Theon in 2016 after senior design roles at BMW, Jaguar, Land Rover and Lotus, and this anniversary car was developed over 18 months with the client involved in every decision that shaped its character.
His standard for a change is simpler than a spec sheet. Belonging beats novelty.
“We don’t measure progress by the changes we introduce, but by how naturally each enhancement belongs to the car,” Hawley says.
A configurator opens the commission process to clients worldwide, North American buyers get on-the-ground support through Humble House, and the first Theon R is in build in Oxfordshire with more than 500 hp on the sheet.
It’s built for the collector who wants to drive the icon hard, and it’s the wrong car for anyone counting original panels.