The bore up was an example. Any upgrades are allowed as long as it doesn't exceed 700PP. The only fully required upgrades are a Type C roll cage (if the car can be fitted with one), ballast (for ballast penalties, racing tyres (you will need wet tyres as well) and a racing number in the livery.
EDIT:
First of all, I have lapped my car around all of the tracks currently involved in the championship (Maggiore was not tested).
I did a 1:10.676 on High Speed Ring. I did a 28.495 on Broad Bean Raceway. For Daytona, I got 49.520. At Blue Moon Bay, I got a 47.518 and in the Infield B layout to be used for the joker race, I got a 48.98. Finally, I have improved my time At Northern Isle, getting a 15.149. However, since doing these laps I have fixed some issues with the car (such as the spoiler not being present) therefore my times may change. The PP has gone down but I do not know if that is reflective of the performance of the car, as while it is slightly slower around BB Raceway (albeit only 0.05 seconds slower) the car is significantly easier to control, which should help me as the car can be quite difficult sometimes.
I have also been doing some testing, and I am going to add some cars to the list of eligible cars. These are the:
- Chevrolet Corvette ZR1 C6
- Chevrolet Corvette C7
- Chevrolet Corvette ZR1 C7 (due to the PP of this car being higher than the minimum requirement for the championship, tuning this car to be in the limits of the rules may either be difficult or lead to a car that is OP - in the case of the latter, the car will be banned)
- Chevrolet Corvette C7 Gr.3 Road Car
- Dodge Viper GTS '02
- Dodge Viper SRT10 Coupe
- Dodge Viper GTS '13
- Toyota Crown
- Toyota GR Supra RZ ('19 and '20)
EDIT 2:
I have finally updated the OP, and there are some changes roughly meeting the changes I said I'd make previously. I decided not to allow the Toyota Crown unfortunately as it would be better in a touring car championship, and sadly this means we won't be able to see a Crown overtaking a Corvette ZR1... The addition of the new cars is mostly for new entrants, although you are welcome to choose a different car if you want. I was initially skeptical of adding sports cars, but seeing the performance of the Corvette Gr.3 Road Car compared to my Mustang, I doubt there will be much of a difference.