as for the two section cross, i have no idea. mystery to me, but i doubt any gains would come from it.

just get an x pipe or have one made and you'll be satisfied with it for a more rounded out performance.
H pipe for a little more stoplight to light thing.
this is kinda like the long tube vs shorttube headers. long for horses, short more for torque. but if youwanna race you always get the long tubes, see what im getting at////hinthint/////X pipe