You have to love the Americans. The Aero was designed to be the fastest production car in the world by being given a 6.9-litre V8 petrol engine. It did achieve the feat by going 412.2 km/h, but the record only lasted a few days since Guinness World Records disqualified it. At least they tried.
8. Saleen S7
Another American supercar, the Saleen S7 got its power from a 7.0-litre big block Ford V8 that made a hefty 550 bhp of power. But that wasn’t enough for Saleen. So it added two turbochargers to the engine, and ended up with nearly 750bhp of power and a tire shredding 950 Nm of torque.