Looking for $350 shipped OBO.
270A is underrated.
For series 3 05+. 2 pin style plug on alternator. Check yours to make sure they are the same.
Cheaper if you pick it up in Bolingbrook Illinois.
I originally paid $525 to have this custom made by mechman because they had no alternator options for my car at the time.
I ordered it 4 years ago but removed it from the car every time the system was out and every winter so it has less than 15k miles of use on it.