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Brand new 3.38 diff, never installed. Improves acceleration throughout the powerband. Retail is $1975, asking $400 or best offer. Fits all 545/550 models with 2.93 diffs.
It's a factory BMW part. I purchased it from my local dealer for my 545 6sp, but sold my car before I had a chance to install it. I'm in LA but can ship anywhere.