I had this wavetrac differential in my manual 2011 135i for just under a year and put about 10k miles on it during that time, used redline fluid. If you're not familiar, the gear ratio for the manual n55 is 3.08. Diff still works perfectly! I'm upgrading to an F80, so it's time to sell all the goodies. I'll also include the HP Autosport wrench needed to install the diff. $1800obo shipped, make me an offer!
Wavetrac Differential 3.08
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