Your car has a mechanical differential.

If you change your diff gearing, you change your final drive ratio...going to a numerically higher diff will improve your 0-60 time, but you'll increase RPMS at all speeds, so can be buzzy on the highway.

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"If God had meant for us to walk, why did he give us feet that fit car pedals?" Sir Sterling Moss

Michael
2014 E63S Estate
2006 SLK55
1995 E500
1986 Porsche 944 turbo