Models such as the insane 5,000-hp Devel Sixteen, the Cadillac Sixteen, and Rolls-Royce 100EX Convertible never made it past the concept stage. The 8.3L V16 engine in the new Bugatti Tourbillon ...

Absurd pipe dreaming. But Dubai-based Devel Sixteen has released a video of its quad turbo, 12.3-litre V16 (built by Steve Morris Engines) on a dyno producing 4515bhp and 3519lb ft of torque.

Originally unveiled at the 2013 Dubai Motor Show, the Devel Sixteen made waves with its audacious claims: a 12.3-liter quad-turbocharged V16 engine capable of producing an astonishing 5000 ...