The problem with a cusco center diff is it is still an open diff. Its not an LSD. It says it right in the description link you gave!

"You can do the Side-turn, with the parking brake, as it does not have the Center LSD function.
･Watch out!: This product is not Limited Slip Differential Gears."


Its not going to help traction (and i mean traction around a corner, coming in or out of it). Its only helping with rotation of the car by biasing the torque split.

Our best option is getting a quaife and trying to keep it together as its well known that they fail because the housing thickness is thin. It has infinite lockup so it will be progressive at transferring power to front or rear.

My car is staying all stock diffs for the sake of getting it out this year or else it would have an EVO rear with a quaife center and a 1way front LSD. The evo rear and quaife center sitting in boxes ready to go.