Yay, an instance where me having been a Legacy-nut helps!
The ONLY year that got rear LSD was MY91, and ONLY the Sport Sedan. That being the US market, of course. Elsewhere it was different as there were more models of the Legacy. The SS was introduced in '91 with an LSD, and it was removed for '92-'94. So if you're looking for a transmission, go for '91.
There was no turbo in '90 so yeah.
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