like i said in 96 they switched from OBDI (On Boar Diagnostics) to OBDII. all the cars after 96 are OBDII . OBDI and II check you exhaust emissions and stuff like that.
so if ur buying a chip for it you know which one to get. but since it's a 96 it's hard to tell just by looking at it which one it is. there are 328s that are OBDI and there is some that are OBDII
in OBDI there is an actual chip that u replace with a new one.
in OBDII u do NOT replace any actual chips. u download the new program into the old chip. like in your computer. that's why it's called software download.
and the only options there are the Shark Injector or Dinan Software download.
and 328s have no LSD , like most of the regular 3 series they come with an open differential. the LSD is only standard on the ///M cars.
but the ratio is 2.93 on the manual 328. dont know about an auto