legacycentral bbs

I have a 1991 subaru legacy sport turbo sedan with the stock
suspention and I would like to upgrade soon but there are more after
market items for the 92 and up suspention setup. How and what do I
need to convert mine over for the rear suspention to work?

The only difference is the top hats and the rear most lateral link. Both of
which can be upgraded with better parts. For control arms look at MRT
adjustable arms. For top hats ask Z1 performance about the STI version. If
you dont have the cone shaped springs forget about the top hats.