Does anyone how much interchangeability there is between the Z31 chassis and Z32, s13 and s14. I want to know about the braking and suspension systems in particular. Thanks

I think some of the Z32 stuff can be fitted to the SX or the Z31 but I don't think it's a bolt on process, the Z31 and Z32 have radically different suspension set ups, what did you have in mind ?

front calipers and rotors from a turbo model

well the Z31T used a 5 lug that the 240sx got in later models, I'd be suprized if the Z31's were any better than the later stock SX units, the Z31T brakes clear a 14" wheel, what size came on the sx? if all the sx's came with 15's then I'd guess there is no benefit, now the Z32's they had some big brakes but I don't know much about the Z32's