Fastest straightline speed in tuners?

[zedextreme8177]

Only tuners, no Race/RM, in either km/h or mph

Without draft= 392km/h (244mph)= Viper SRT10 ACR
With draft= 418km/h (260mph)= Nissan GT-R Spec V

 

[Furinkazen]

Veyron - 272 mph

 

[svennieking]

ferrari enzo - 420 km/h

 

[F1Addict]

I got my V-Spec Nur Skyline to about 230mph without draft.