I was told that over a open differential, the sure grips/or posi type can take up to 15% of the turning torque away. Also up to a certain level an open differential will get better acceleration on the street. That the torque advantage can be 2:1 at times, from a foot braked start. Knowing converters can do stall tricks , this might be something possible in the differential?

Could a mild performance build benefit from the open rear end?

Is it that you just like 2 lines?