I'm 2.5 inches away from the rotor surface now at the most outward part of the wheel which means with the extra thickness of the 13 inch rotor and the 1.9 inch caliper distance from the surface of the rotor isnt enough to hit.

Just bouncing numbers off the wall per quick measurements...

The difference in thickness between what I have now (950) and the viper rotor is .31 inch, and if the caliper extends outward 1.9 inch from the rotor surface, the viper rotor will leave me about .29 inch clearance...

Total outside radius with caliper would be a bit over 7 inches...not enough to hit on the outside...