X vs. H
"The X-pipe creates much more of a scavenging effect. That said, it is important to prevent the X-pipe from necking down too small or flow can be hampered. "
It's not clear to me that the case on this issue has ever been based on "flow" by these options. I always felt that it was more due to tuning thru "Helmholtz resonance" benefits.
I do fully accept that the effect can be altered by tubing diameter, but flow is not the primary concern needed to achieve desired "Helmholtz resonance" benefits..
I also have a hard time comprehending how much flow takes place in high-speed exhaust thru a typical H pipe solution.
