I am thinking of stacking an XZT with my juice anyone have this stack? Does it work well? Would the standard Quad work better, or is it more than just pressure?

 

I have the standard Quad box, these are not pressure only boxes, of the sixty hp of the XZT about thirty is from pressure, the rest is the fueling duration and boost fooling. You will be able to achieve around 40 psi of boost.
This are considered by many to be mild pressure boxs. I like the standard because of the ability to shut them off or keep it on a thirty hp setting instead of a constant sixty hp. Then you can always switch to the one hundred setting if you have the need