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Originally Posted by FEDE/E92
My E92 come stock with 3.46, which M3 diff should I use 3.15 or 3.85?
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Depends on if you want taller or shorter gears. Completely up to you. 3.15 will make your acceleration slower, but better traction down low and longer low gears. 3.85 will make your lower gears even shorter and traction harder to come by, but get you up to speed faster if you can put the power down.