There are restomods, and then there are Singer restomods—the kind that make you wonder whether Stuttgart’s original engineers would smile, cry, or quietly take notes. Now Singer Vehicle Design has taken its obsessive reimagining of the Porsche 964 to a new level by teaming up with Red Bull Advanced Technologies, the engineering skunkworks behind Formula 1–grade simulations and structural wizardry.

Yes, that Red Bull.

The goal? Fix the one thing vintage 911s have never been great at: rigidity—especially when the roof goes missing.

Singer’s customers are the sort of people who know exactly how a car should feel at 140 mph through a fast sweeper, and they aren’t shy about asking for more. “Our clients are some of the most demanding drivers in the world,” says Mazen Fawaz, Singer’s head of strategy. “To achieve the standards they expect, we only work with the best.”

So Singer called in the people who build race cars that survive 300-kph curbs.

Step One: Tear It Down to the Bone

Every Singer restoration starts the same way: total annihilation.

The donor Porsche 964 is stripped of everything—body panels, interior, suspension, drivetrain—until only a bare steel monocoque remains. What’s left looks more like an archaeological artifact than a car. That naked shell is then cleaned, inspected, and prepped for what amounts to structural surgery.

This is where Red Bull Advanced Technologies enters the picture.

Using high-resolution 3D scanning and old-school hand measurements, RBAT digitally recreates the entire 964 chassis in a virtual environment. Every seam, every weld, every curve of 1990s Porsche steel is mapped. But the real magic comes next.

Formula 1 Math Meets a 1990s 911

RBAT feeds that digital 964 into Finite Element Analysis software—the same kind of simulation used to determine whether a Formula 1 monocoque will survive a 200-mph crash. The software twists, bends, and loads the Porsche chassis in thousands of virtual scenarios, identifying exactly which areas are weakest, especially in Cabriolets and Targas, which lack the structural help of a fixed roof.

Then the engineers start reinforcing.

RBAT designed 13 bespoke carbon-fiber structures that integrate into key load-bearing areas of the 964’s steel chassis. These aren’t bolt-on braces or aftermarket roll cages—they are carefully engineered, bonded and joined during the restoration so they become part of the car’s skeleton.

The result? A 175 percent increase in torsional stiffness.

That number is not a typo.

According to Singer and Red Bull, the reinforced open-top cars now match the rigidity of a coupe—something Porsche engineers in the early ’90s could only dream about.

Why Rigidity Matters

Chassis stiffness isn’t something you brag about at car meets, but it’s the secret sauce behind everything that makes a car feel right.

A stiff chassis means more precise steering, more consistent suspension behavior, better braking stability, and fewer squeaks, rattles, and shudders over rough pavement. It also means the car feels calmer and more refined at speed, even when it’s being driven hard.

In other words, it makes a 30-year-old 911 feel like a modern performance car—without losing its analog soul.

Built for Singer’s Brutal Turbo Cars

This Red Bull–engineered structure was developed specifically for Singer’s latest tribute to the legendary mid-1970s 930 Turbo. These aren’t gentle classics. They pack between 456 and 517 horsepower, send it all to the rear wheels through a six-speed manual transmission, and now sit on a chassis that’s finally strong enough to handle that kind of punishment.

That means fewer compromises, even in a Cabriolet or Targa. Roof off. Throttle pinned. No flex. No drama.

The Ultimate 964

What Singer and Red Bull have done here is more than just reinforce a classic Porsche. They’ve solved one of its fundamental flaws using tools developed for modern motorsport.

It’s a fusion of old-school air-cooled character and bleeding-edge structural engineering—a 911 that looks like 1990 but behaves like 2026.

And if you think that sounds expensive, you’re right. But for Singer’s clientele, perfection is the only acceptable option.

Source: Singer Vehicle Design