Free bump. Im interested in this too. I was thinking of how to experiment with runner length tuning by not having to modifiy my already-completed custom intake manifold for my R1 carb'ed 16V. Instead of just slapping on 4 filters on the carb intakes, I could fabricate various size runner tubes that I could place in between the filters and carbs.
But I dont know if that would have the same effect as actually changing the intake manifold's runner length.