Im running the center diff. previous owner has set diffs up at 5/10/3 from my memory as he ran high bite tracks.
Unfortunately the 7.5T is already on its way. I run a 8.5T or similar in my SCT so i will tune with what i have. May turn down EPA if need be.

Previous owner installed 37.5wt 1.6 piston front and 32.5wt 1.7 piston rear.
That is the main setup i have to work with for now.

Tires are a combo. I received pins, bars and slicks with the car, mainly bars however. the track is a medium bite hard pack that can get a little dusty at times so may stick with bars for the future.