In town or on the highway I can't feel the benefit of a closed LSD even if there is one.
However, with DSC OFF on a mountain road you should be able to tilt that driver/BMW=25/75 scale more to the driver's favor. More so if it's raining. However it tends to snap away from the driver (or my poor skill hard to catch the car) than the gradual drifting away when I am too liberal with with the throttle. I'd like a closed LSD still, but then the cost for me is becoming difficult to justify with this car. YouTube shows talented drivers can drift the car; I did get "pure lucky" and drifted once or twice
Have fun and please make sure there is enough run off area