The BMW X5 V12 Le Mans is one of those rare, wonderful moments when a carmaker momentarily forgets about accountants, regulations, and common sense, and instead asks a far more entertaining question: “What if we shoved a Le Mans–winning racing engine into an SUV?” When I saw the X5 Le Mans during my last visit to the Pace Museum by JP Performance in Dortmund, it felt almost unreal to be standing in front of something so unapologetically absurd.

Built around the turn of the millennium, the E53 X5 V12 Le Mans, was never intended as a production model. It was a one-off experiment, a celebratory engineering flex created after BMW’s 1999 victory at the 24 Hours of Le Mans with the V12 LMR prototype. To mark the occasion, a handful of BMW’s most mischievous engineers decided to repurpose the heart of the race-winner: a 6.0-litre naturally aspirated V12. But unlike the race car, which had to breathe through air restrictors, this engine was allowed to inhale freely. The result was more than 700 horsepower in an era when supercars were still struggling to reach that number.

That colossal engine sat inside the shell of the first-generation X5, but this was no ordinary family hauler. The suspension was heavily reworked, the interior stripped down and fitted with a roll cage, and the hood reshaped in carbon fibre to clear the V12’s intake system. It retained a six-speed manual gearbox and rear-wheel-drive, making it perhaps the most spectacularly overpowered manual SUV ever created.