When you can no longer source front brake shoes or rear wheel cylinders or correct spec SP rotor housings for it

The final time I took the car out, I actually ran it with a first gen RX-7 transmission in it because I couldn't afford to lose an RX-3 trans. Do you know how hard it is to find an RX-3 trans?

I really wish I had enough money to keep the RX-3 and just go nuts with it and run an SPx class with it. That's what the current owner is in the process of doing.

So, in short, run it until you find yourself having to "cheat" to put it on the grid. The good news is, the Z's won't ever have a problem sourcing rotor housings