What about implementing a system in game that allows players to change some functions of the car like TCS strength , ABS strength, Brake balance, Fuel mix maps, A RADAR, track map and anything that we can imagine. I know realistically not every car have systems like this but it would be a lot more fun if they implemented all these features inside the upgrade system, the game already have some strategy in game (with the tires and fuel) and that feels great, now imagine if this system is implemented in game. I think it would be fun!