I normally avoid internet "pissing contests" but DaveO is a very decent guy and has set records that speak volumes about his abilities as a rider and an engine designer/builder. Additionally, he shares insightful, practical information freely and is always willing to help. As to changing the size of the airbox, there is more to it than what might be seen at first glance. Without getting into a bunch of wave tuning theory, the airbox facilitates something called the "Helmholtz Effect" and changing the volume of the airbox could alter tuning resonances. If you were to do nothing else, increasing the volume of the airbox would lower the tuned RPM of the engine.
