well like the title says whats a better stack with smarty...? the pressure only xzt or mp8

 

Either one, take your pic. Quad X2 has a built in RP gauge. I personally like it better but you have more adjustability with the MP8. It's a toss up.

 

I have run both. The xzt gives a little more down low - a little. It runs out of oompff though after initial input. The mp-8 is adjustable and will give you a larger overall power gain. With the ability to adjust torque management on the Smarty for low end, the mp-8 is a far superior choice to add pressure. Just my 2 cents.