A member here called 30PSI has fitted a s13 lsd into his s12, so he's the man to ask, maybe send him a pm.
The s12 discs (4x114.3) also bolt at the back so i believe you can't use any other discs, you can get grooved black diamond s12 discs and uprated pads though. Northener, another member here, has fitted s14/z32 calipers to his with the s12 discs and says they make a huge difference without being too hard to fit.
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