ZF Limited Slip Differential often found in BMW E30, E36, E34, Z3 and such has cast iron parts that often fail under increased load/power.
When you change the ramp angle to 30°/30° or 30°/60°, there is an increased risk of the differential cap breaking.
So a reinforced billet steel cap is a permanent solution.
By installing it, you will avoid a cap failure for good.
You have a LIFETIME WARRANTY on it!
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