X pipes flow a little better.
H pipe = more power in lower rpms and deeper exhaust tone.
X pipe = more power in higher rpms and a little higher pitch sound.
I prefer the x pipes on the 4.9's. I had one on a 91 4.9 Mustang I had and it sounded bad ass!
That said, yes an H pipe will work also.
It's a truck, low RPM power FTW!

