pulses from one side feeding the intake of the other for timing purposes.
It supports what I said about an article printed last year in New Zealand I believe. #1 they had to have long intake runners to support the low and mid range torque according to their dyno testing. #2. Because of space constraints, they had to make it cross flow to avoid 180 degree bends in the runner. If it was not cross fed, a 180 degree bend would be needed. This bend produced a drop in torque in their dyno testing. The cross flow made the runners as staight shot as possible to maximize volumetric effeciency.
I will do search and find the article for you. The article you listed above makes perfect sense.