Slant six dual exhaust proposal

Pete Hagenbush (sp?) was one of the engineers who helped develop the 2 barrel Super6. In an article in Allpar talking about the /6 he said splitting the exhaust in two, 1-2-3 and 4-5-6, running 2 pipes back about 6-8 feet, then re-joining them into a single exhaust out the back made a lot of power. He wanted dual exhaust on the Super6 but it was not done because of the cost.
You get a 2nd, lower RPM resonance doing this; has been pretty common with 4 bangers using 1-4 and 3-2 into their own pipes and then recombined into one large pipe later. The 2nd lower resonance point is to help the low and mid range torque. I would do the combining into 2.5" pipe well before a single muffler to acheive this.