Last year, we told you about Singer and Williams's Dynamics and Lightweighting Study, which was the development of a wildly modified Porsche 911. Today, it's here. At the Goodwood Festival of Speed this weekend, Singer is showing off the first two restorations from this collaboration, a white 1990 911 (pictured here) and a red 1989 911 (debuting this weekend). They are a feast for the senses, to say the very least.

Both have 4.0-liter, air-cooled flat-sixes making an astonishing 500 hp without the help of turbochargers or superchargers or anything. This one was developed by Williams Advanced Engineering with the help of Hanz Mezger, the Porsche engine genius who developed the first 911 flat-six and all of the company's Le Mans-winning motors. Unlike most air-cooled Porsche flat-sixes, this one has dual overhead cams and four valves per cylinder. Those valves are made from titanium, naturally, and Williams used a lot of magnesium throughout, too.

Courtesy Singer Vehicle Design

Oh, and it revs to 9000.

At a quick glance, the bodywork looks like it could've come from a 911 RSR, but it's all bespoke to this car, made from carbon fiber. Williams worked on balancing the weight of this 911 as much as possible, moving the engine forward slightly and relocating other components to the front trunk.

Courtesy Singer Vehicle Design

It's all aerodynamically optimized, too, with a small air channel at the rear window designed to work with the ducktail spoiler and diffuser, making real downforce. Norbert Singer, the legendary Porsche Motorsport engineer who ran the company's Le Mans program for decades helped with the aero. The engine breathes through two ram-air intakes integrated into the rear quarter windows, while a vent in the spoiler helps expel air.

Courtesy Singer Vehicle Design

Everything else here was made specifically for this car, usually out of carbon-fiber or some other lightweight material. The seats? Custom carbon-fiber Recaro buckets. Steering wheel? Custom carbon-fiber Momo Prototipo. Brakes? Carbon-ceramic Brembo discs with monobloc calipers. Wheels? Center-locking BBS magnesium 18-inchers made to look like old Fuchs alloys.

Courtesy Singer Vehicle Design

Williams designed the suspension, which is equipped with remotely adjustable dampers, and the tires are Michelin Pilot Sport Cup 2s in a custom size. The ABS, traction, and stability control brains come from Bosch and it has switchable driving modes. Completing the package is a six-speed manual designed by Hewland—no autos or dual-clutch transmissions here.

Courtesy Singer Vehicle Design

Singer will offer the modifications shown on these two restorations to 75 clients, but pricing hasn't been announced. If we had to guess, we'd say at least $45 billion, but we're bad at math.

At Goodwood, one of the two Dynamics and Lightweighting Studies will run up the famous hill climb, while the other will be on display outside Goodwood house, with a handful of other Singer-restored Porsche 911s. We'll be sure to take a very, very close look at this carbon-filled beauty, and try to talk to some of the people behind it.

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