The standard Demon produces 840bhp and a standing 1/4 mile in 9.65 seconds which for a production car is awesome.
However, let Hennessey have a play and with a few tweaks like replacing the 2.7l supercharger with a 4.7l one and a few other fuel and exhaust mods and you get this fantastic upgrade.
1035bhp at the engine and that's 880bhp at the rear wheels and a 9.14 1/4 mile at 152mph. The 0-60 drops from 2.3 seconds to 1.9 seconds.
Watch the video and see the tyres deform on launch.
Take your car in and you get a supercar with a warranty.
All images and video by permission of Hennessey Performance