I have been following this thread for a bit and agree on the single intake idea. I don't see how you couldn't improve over stock. The air box is right over the motor heating the air and there is close to none as far as room for the air to travel. Ideally I would say a single 3 inch pipe from throttle body down the side of the motor to a single cone filter and get rid of the whole airbox all together (if you don't mind seeing the motor).