They can be stacked for great results. Gotta have the newer x2 with download capabilities and put on the stack program.
It is the best of both worlds, adjustability and smarty power.
Got money for a clutch? If not keep the xzt turned down.
I am to chicken with my stock auto to try it. Have a xzt2 and a JR. Jr stays on 70 all the time, A little diff than the xzt2 as far as power wise.
Good luck.