Originally Posted by JayKay335i
Search. Somebody fitted an m3 diff. Not sure if it was e90 or e46. The aftermarket ones are also good choices.
It's purely as I've seen an M3 rear diff advertised and thought it would be easier to just swap the whole diff rather then fit an aftermarket one.
Will it affect the final drive ratio though?
I'll do a search or if anyone else finds the link please let me know.