Quote Originally Posted by claudio
so best option is to change box not diff? i really like lsd but which one if i do go for it,
Yea a 6 speed with your current 3.45 ratio small case diff would be sweet

Otherwise if you want to go for an LSD, a medium case 3.15 would be a nice balance between motorway cruising and acceleration with the 5 speed box. Although I can imagine if you have the 3.45 ratio at the moment anything less will feel like a downgrade.

Edit: I seem to remember @[Valdelisbmw] having a rebuilt 3.15 LSD I was eyeing up last year. Not sure if he still has it but would be worth a shot as an alternative option