Ever dreamt of a Ferrari F40 GT1 with a naturally aspirated V12 from a 550 Maranello? Probably not, because who would? But that’s exactly what Simpson Motorsport has conjured up, and it's called the ‘Simpson-Ferrari V12 GTR’. This rare beast is set to go under the hammer with Iconic Auctioneers later this summer.

This isn't just any F40; it’s believed to be the only factory-backed V12-powered F40 ever built, thanks to a unique collaboration with Simpson Motorsport in the late '90s. Under the bonnet, you'll find the ‘F133’ V12, mated to a Hewland six-speed sequential gearbox. While exact figures aren't disclosed, expect it to surpass the 550’s stock 357 kW (479 hp) and 570 Nm (420 lb-ft) of torque.

The transparent engine cover showcases this mechanical marvel, harking back to a time when such features were more common. While we might miss the turbo flutters of the original V8, the V12's soundtrack is one of Ferrari's finest.

Mechanically, details are sparse, but we know the chassis is from a crash-tested F40, rebuilt for racing. Custom suspension components are fitted at each corner, beneath a body lightened and reinforced with GTE-grade F40 panels, including aggressive front and rear splitters. The bespoke rear wing is massive, so you might need a pilot’s licence before you take this beast for a spin.

Inside, it’s pure motorsport. An FIA-approved roll cage sits behind the single front seat, surrounded by a dashboard bristling with racing switches and buttons. Probably best not to fiddle with those without some serious track-side expertise.

This car has seen action in various European competitions, with a notable second-place finish at a Britcar event in Oulton Park in 2006. Despite its mixed racing legacy, its uniqueness makes it an incredible one-off.

Tempted? It’s up for grabs at this year’s Silverstone Festival in late August, with an estimated price tag of around £600,000. That’s about what you’d pay for a fully loaded SF90. Decisions, decisions…