As of 2015, the fastest street-legal car is the Hennessey Venom GT, according to TheSuperCars.org. The Ferrari F40 with Tubi exhaust is one of the loudest cars in the world, as stated by Fast Car.
The Hennesey Venom GT is listed as the fastest street-legal vehicle due to its incredibly powerful Twin Turbo V8 engine, according to TheSuperCars.org. This engine is capable of producing 1244 hp and achieving speeds of up to 270 mph. The high horsepower rating also contributes to the car's loud volume.
Almost as fast as the Hennessy Venom GT, the Bugatti Veyron Super Sport is capable of reaching speeds of up to 268 mph with a 1200 hp engine, notes TheSuperCars.org. Horsepower measures the amount of work an engine can do over time, meaning that the greater the horsepower, the faster the car model is, as explained by Web-Cars.com.
The Vauxhall VXR8 GTS, McLaren P1, Ford Fiesta ST and Ariel Atom are recognized as some of the world's loudest cars, according to BT.com. While these cars feature significant horsepower, they are known specifically for their high noise level. The Nissan GTR is another loud model; it's famous for its rumbling 550bhp engine, as stated by BT.com.