Yes, I know the difference between the B4 and B4.1 outdrives
What I was asking was do X Factory make their own version of the B4 diff outdrives (as they make other similar parts such as front axles, drive shafts, slipper plates etc)
Just did a quick search on the DMS website couldn't find any listed
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B-Max 2 MR
KEEP RIGHT ON
BLUE IS BETTER 
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