Pretty sure it's 25%.
Here's a quick and dirty list for medium case helical diffs:
3.07: 3.0L Z3, MT
3.15: 2.8L Z3
3.46: 3.0L Z3 AT and 2.5L MT
4.10 2.8L Z3 AT
And yes, for the exact reasons nrubenstein described, you may want to consider a clutch-type diff.
Here's a quick and dirty list for medium case helical diffs:
3.07: 3.0L Z3, MT
3.15: 2.8L Z3
3.46: 3.0L Z3 AT and 2.5L MT
4.10 2.8L Z3 AT
And yes, for the exact reasons nrubenstein described, you may want to consider a clutch-type diff.
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