OK. I have the the kit anyway, It is no big deal to drill and tap a second hole into the other chamber. I'll connect it to both headers and see what happens.

But, do the math. At 2000 rpm's there are 6000 exhaust pulses per minute. That means that an exhaust pulse has 0.01 seconds (1 one hundredth of a second) to travel through 24" of manifold chamber until the pressure reverses to the opposite direction.

That is not really circulation.