Singletrack, why can't we talk about the h-pipe? Yes, Sal did explained why he put the h-pipe where he did but I still find it interesting that most other x-pipes lack this feature. We may discuss the advantage and disadvantage of the combo design. Maybe, Akrapovic and Evolve have arrived at the same conclusion but what about the others? Maybe there is room for improvement. Just because Akrapovic and Evolve said it's their final design it does not mean there is no room for improvement.
I don't get what you are getting at.