Originally Posted by cv129

so question is really about what l's the true cost for FI a Z.

Let's tally up:

FI parts
Support mods
Shop time
Reserve for broken parts
A reliable daily car

How much is that? $20k? $25k?

FI is like a major surgery. There's no guaranteed results. Something can go wrong either at the surgery table or afterward. You gotta have strong $ reserve to deal with potential consequences. Make sure you can take a hit if/when it happens.