Very Interesting indeed.
I had a quick look at the ETK and sure enough there have been various part numbers for the differential. However according to ETK the actual diff has been always the same for CSL and M3 and has not ever been shared with the Z4M.
http://bmwfans.info/parts-catalog/33102282480
Quote:
Originally Posted by Chad
Hi select. If you google up e46 m3 lsd , the hole where you see the plates is round on the m3. . Where as on csl it's more of a u shape hole . I always thought they were the same as no info on this on differences spec csl to m3. I could be wrong of course but don't think so , z4 looks the same ,but number on lsd is different, if you can see it on pictures,
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I think thats because - as i have stated above - there have been quite a few revisions of the differential in the past. So its production year related not an actual difference between M3 and CSL.
In short, im sure if you were to take a differential from a 2003 M3 and compare with a CSL it would turn out to be the same.