KMP has produced a stronger, but also lighter final drive for the BMW 210 differential with a ratio of 5.43. The BMW 210 with 5.43 ratio suits most BMW E36 M3, E46 M3, E9X M3, E34 M5, E39 M5 and more. The crown wheel has M14 threads (10x). Always check which model type is needed.
Benefits of a Motorsport Final Drive
Longer lifetime of gears
Specifically designed for motorsport
Less teeth for more strength
Stronger material compared to OEM
As a rule of thumb you can check the number of bolts on the side cover of the casing.