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      08-04-2010, 12:45 PM   #15
JCz04Bimmer
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Drives: 06 Z4MC
Join Date: Feb 2008
Location: New York City

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I never installed it but it is a used part. The story is that the guy I bought this from knows a race shop that rebuilds their differentials literally every time they do an event. The guy takes the ones that are good (rarely are these parts bad, actually), cleans them up, ensures proper functionality and sells it. The condition is like-new since this is REM polished which not only reduces friction but also increases strength.
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