I guess I am the only deviant here. Rinehart TDs are the only system with a true, three stepped header, at least that I am aware of; the others use a two step header. A three stepped header scavenges better and typically, not always, help the low end.
I like the look of duals on a bagger, just think a pipe under each bag looks right. There are options for 2:1 systems, like the D&D Fatcat, that offer a ghost pipe to retain the dual look but gain whatever benefit there may be from a 2:1 system.