I decided to just keep my current rearend and gears as they are new and less than 1k miles. I have plenty of local BMW mechanics for the work but is this the part i need and what is the exact difference? Which ones better.....
BMW E30 E23 E24 E28 E36 Clutch Type Limited Slip Differential LSD 188mm Spool | eBay
BMW E30 E23 E24 E28 E36 Clutch-type Limited Slip Differential LSD 188mm Spool
And......
OBX Helical Limited Slip Differential LSD BMW M3 E30 E36 Z3 6 Cyl Z3 M Roadster | eBay
OBX Helical Limited Slip Differential LSD BMW M3 E30 E36 Z3 6-cyl Z3 M Roadster