The ZF unit is a lot cheaper than the OS Giken and you can also customize ramp angles and preload. Not sure you can do that on the OS Giken as easily.
The M-Lock unit has no lock up on decel. A 35/60 ZF does...this will induce some understeer. A clutch type diff is a little different. If you lift, you're probably gonna spin. But...with a ZF LSD in my 330, it felt like there was a direct connection between the rear tires and my right foot. Loved it!
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2018 F30 320iX Melbourne Red
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red
2000 E36/7 Z3 Steel Blue
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