This.
I was happy to find out I could accurately mimic the handling and drivetrain characteristics of my own real life vehicle.
Unfortunately I no longer have possession of the pants mobile due to PD's patch. I guess there is an issue with modifying data, but all I did was make a vehicle slower in every aspect, not add 1,000,000 BHP.
This game of chess with PD will get interesting once we rediscover a method. Until then it's back to the shelf with GT5, as it collects dust for my ant experiment.