It's symmetric, both mixed triples of the six. Scavenging would be closer to equal for each cyl. Total length would have been a result, an in out ratio for the last several inches that was close to original tuner ratio or 1:3 maybe was tried, can't see how it wasn't. Just going by the pics. Not sure about leading pulse tuning without seeing internal chest. Must have worked, everyone doing it, lol.