hmm where to start.
there are 4 different types of da6 here in NZ.
non facelift xsi
non facelift rsi
facelift xsi
facelift rsi
the 1991.7 to 1993.3 integra rsi was the quickest out of the all.
the RSI is the "downspec" model. it doesnt have aircon, powersteering, it has wind up windows, no centrel locking, manual adjust mirrors, no wiper on the back window.
RSI's are quite rare, its pretty much imposible to find one, never mind finding one with an lsd its just not guna happen.
the difference between facelift and non facelift are:
b16a1 vs b16a2
different factory bodykit, font an rear. (forget about sideskirts, they are fuckin rare)
different tail lights
different gearbox
different loom and computer
speedo has 8200rpm on gen 2 and 8000 on gen 1
gen1 has 160hp and gen 2 has 170hp.
gearbox years:
from my understanding, da6's had different gearbox everyear they were produced.
89-90 gearbox: S1
90-91 gearbox: J1
92-93 gearbox: Y1
also to my understanding lsd gearboxes only came from a DA9 integra. which is the 1800 dohc non vtec model.
LSD code = YS1, but they were only an option, so even if you have a ys1 it could still be non LSD.
theres heaps of stuff about them, im lucky enough to have a genuine japanese brouchure from 1992 explaining options and pictures when DA6's were brand spankers.
heres a few pics from Japan:
