Originally Posted by Drawn05
I have the M3 rear on my FBO 135i and I am also 6AT. Going taller than stock sounds silly to me. I have the 3.85 of the manual M3 and it is perfect.
Just wanted to ask you about your rear diff. Did you use the m3 diff with sideshaft?
Did you only change the cv joint to m3 or did you used the whole shaft?