Brand new 3.73 diff, never installed. Shortens the final drive gear ratio for quicker acceleration throughout the entire powerband. Retail is $1975 from BMW, asking $600 or best offer. Fits all 525/530/535 models with 2.93/3.46 diffs.

 

wow if u swap from a 2.93 diff to this your revs in 6th gear at 60mph are gonna be like what? 3500?