Re: Money spent on upgrade in vain

Actually, you can see the parts PR drop in all cases, where the new part has fewer stars than the old one. That is always for blue to purple and purple to gold parts, and sometimes even from green to blue (classic sport and muscle cars).

And just for the record, there is always drop of PR of that part (when losing a star), but it may not transfer into cars PR status (usually for less important parts like Ecu/Nitro).