I achieved about 493 km/h @ 13550 RPM without drafting in Red Bull x2014 Fan Car, with top speed set to 500 km/h and gear 7 set to the furthest possible left. When drafting, the same car with the same settings can reach 512 km/h @ about 14000 RPM.
I hit 440 Mph with my Tomahawk X VGT, without drafting or nitrous on Special Stage Route X. I have 2,695 HP/ 13,800 rpm - and - 943.4 ft-lb/ 11,300 - putting it at 964 PP. Trans set at 391 Max Speed, and Final Gear at 3.000. Suspension Setting is - Ride Height, Fr 100 - Rr 70, - Spring Rate is Fr 23.09, Rr 21.05. Dampers FR 10 / Rr 1 (comp + exten) and Anti-roll bars at Fr 7 / Rr 1. With Racing Soft Tires Front and Rear.