H or X CROSSOVER?

Many years ago I wondered the same thing about x versus h. Similar specs but more cam. I went x pipe? I called TTI at the time and asked their opinion. At the lower power level per 2.5" pipe it was mostly preference it seems.
The x pipe may be a little quieter with the same mufflers in your case. This is at the cost of killing some of the sound characteristics that individual head pipes have. The H pipe may be between the two as far as sound.