Quote:
Originally Posted by chriszeh
my understanding of it is that an H pipe allows some equalization of pressure from side to side thus reducing backpressure to a small degree but an X pipe brings the two sides together allowing scavaging of exhaust gases from the other side creating a much greater pressure drop hence freer flowing exhaust.
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No, they function the same way. Just different ways of tuning the scavenging, you can really only vary the position and size of an X pipe, where you can vary the width, position and size of an H pipe. Akrapovic's Evolution (and Gt4) midpipe use both X and H pipes. I haven't seen a significant difference, I ran both the Akrapovic and Challenge mid pipes and they both work pretty similarly and sound similar too.