The game will be very interessant if in off-line mode, you can buy some performance upgrades to your car, like:

Engine
Transmission
Suspension
Better Tires (Grip or Drift)
Brakes
...

that's my suggestion, and will be very interessant if needs an specific car to some parts.

Or:

You need to do a custom car, and a custom setup to do this.

I hope you read this and take it seriously.

Thanks for your attention