I changed from an extremely noisy ford diff in my 2010 self build car to a BMW unit which was fitted by CCM at a reduced cost. In some installations, some owners of the new BMW diff found loose mounting bolts, cracked carriers and even damaged brake lines from protruding bolt heads. When I reported this problem with the brake line, CC picked up my car from Cheshire for further inspection at the factory. In time a modified carrier was released most of which I understand went to the race cars as a priority. i didn't go with this option as I had heard a third carrier was being designed which indicated to me the second carrier still needed to be improved. Eventually it was released and I opted for it to be fitted by Kenricks in Llangollen with all costs being covered by CC. This solution included a new alloy diff backplate as well as the carrier reducing the weight and has proved to be trouble free since. Hope this helps.