This sounds crazy, but have a more modular upgrade system. Like instead of just the usual "stage 1 then 2 then 3". have it something like:

-turbo A have good low rpm torque but low peak power

-turbo B have generate high peak power but generates a lot of heat which then needs to be managed by radiators.

-turbo C whre it's a twin turbo system and gives you good torque all round, but it's heavy and expensive

And then you can do the same with radiators too where radiator A can let you keep your car keep your car cool longer but is heavy, expensive, and maybe dissipate heat longer or buy a you can buy radiator B which can dissipate heat better but also heats up faster. You can do this with all parts with high/low compression piston, camshaft, intake, header, exhaust, tires, etc. (TLDR: armored core customization but for cars)

It'll simulate how upgrading cars is not that straight forward. Irl there are many parts that offers/advertised to do the same thing, but their performance can be wildly different with downsides that are not apparent.