"H" or "X" Pipe advice Please

My muffler guy didn't do the heat thing cause I brought the car down with the headers and collector extension already on and the Jegs X pipe kit in pieces. he put the X a little after the frame member kinda like the TTI premade X pipe setup. We left some room in a straight section before the flow 40's that are bacl by the axle and dump on the ground under it. I plan to put a set 0f 14" straight through resonators in that straight section to remove a little unwanted resonance that occurs right as the cam is waking up around 2200.

The car went 0.10 faster in the 1/8 after putting on the 3" X section and the mufflers. TTI claims 15 more HP with it.