I am trying to upgrade my 93FD but I want too keep the stock tubos, my questions are:
how much Horse Power can I get from stock turbos?
what will I need to upgrade to get there?
and also which are some brands for parts that are good quality but not super expesive like greddy or hks?

Thanks

 

There is a 3rd gen specific section on this forum, mods and power expectations for the stock twins have been covered there for over a decade...

I'd try starting your journey of learning by searching through there.