This is the HF-11, a 650bhp limited edition that revs to 12,000rpm

This is the HF-11, a limited-edition supercar described by its Californian makers as ‘unhinged’. A redline of 12,000rpm in the ICE version certainly backs that up.

It’s the work of Oilstainlab, who you’ll remember from the Half-11 that Top Gear’s Rob Dahm drove last year. That car – a half-sized ode to motorsport tech from the Sixties and Seventies – was just the precursor.

It’s all spun off a bespoke carbon monocoque that took OSL and its partners some 3,500 hours over two years to fully design. It allows for “exceptional modern safety” and technology, but also the fitment of a driver measuring up to 6ft 3in in height. With a helmet. Take that, Lambo Temerario.

Indeed this cabin promises good vision, and better egress and ingress than competitors. And the monocoque also allows the fitment of two drivetrain options.

On the one side, there’s the choice of a mid-mounted petrol-powered flat-six offering 650bhp and that 12,000rpm redline, together with your choice of a six-speed manual gearbox or a seven-speed ‘quick shift’ sequential.

And on the other side? A full electric setup, with OSL promising a “quick swapping system” between the two. It's early days, but the team is looking at an 80kWh battery, and... 800bhp. Both versions weigh well under a tonne, by the way: a projected 953kg for the electric HF-11, and just 907kg (2,000lbs) for the flat-sixer, so it should be... sprightly.

That all points to OSL founders and brothers Nikita and Iliya Briden’s ambition to give the HF-11 “grin inducing analogue driving”. As such, there’s a ground effect aero package “retaining a minimal design”. Indeed, it’s a sweeping, compact, aero-honed silhouette, packaged up into a small footprint.

“Five years ago, we knew to define our future we needed to build our past, the Half-11 Prototype, a vehicle that would defy reality,” said Iliya. “In the years since, we have distilled that vision of nostalgia, driving ourselves half-mad in technology and engineering.

“And finally, today we are proud to reveal our maniacal HF-11 to the world,” he added.

Just 25 of these cars will be built – with 11 marked out for a special ‘Maniac’ pack – while each one starts from… $1.85m.