I'm new here but this is the fastest I know of it's brand new and it IS NOT a concept It's first owner bought this on august 28 of 04 talk about speed it even blows away the mcclarin f1 out of the water
Koenigsegg CCR
Engine: Supercharged V8 | Power: 806 hp | Torque: 920 Nm Acceleration: 0-100 km/h: 3,2 s | Topspeed: 395+ km/h | Chassis: Carbonfibre semi-monocoque | Body: Carbonfibre, Kevlar Aerodynamics: 0,297 Cd | Weight: 1180 kg