The fastest street-legal car of all time is the Koenigsegg Agera RS with a top speed of 277.87 mph (447.19 km/h). The Agera RS is a limited-edition variant of the Koenigsegg Agera, and it was announced in 2015. It is powered by a 5.0-liter V8 engine that produces 1,341 horsepower and 1,011 lb-ft of torque.
The Agera RS features a number of aerodynamic enhancements that help it achieve its high top speed, including a rear diffuser, a larger front splitter, and active underbody flaps. It also has a seven-speed dual-clutch transmission and a modified suspension system that helps to keep the car stable at high speeds.
The Agera RS is a limited-edition car, only 25 units were produced and it is intended for street use. Koenigsegg claims that it was able to reach this speed thanks to the car’s lightweight construction, powerful engine, and advanced aerodynamics, as well as its advanced suspension and braking systems. The Agera RS represents the ultimate in high-performance street-legal production cars, and it is a testament to the engineering expertise of Koenigsegg and the capabilities of modern technology.