I've done and won the Viper race yesterday with a conventionally tuned 750 PP Viper GTS '13. I must admit I really struggled and the two wins I achieved were hard fought.

I've now built a Chiron-engine-swapped monster tuned to the max sitting at around 850 PP. Winning became easier of course although I'm not good at tuning and had a hard time keeping that thing under control, but it's not that I could "demolish" the AI competition. These guys still keep up and I wonder whether PD lets us run against the swap versions next time.

But whatever ... I got NOS onboard that I haven't used yet !