Agreed, Honda engineers spent a lot of time getting the stock intake track tuned (and tunable). As long as the engine and exhaust are near stock the factory airbox can't be beat. A heavily modded engine/exhaust will require considerable tuning on the intake side. You should still keep the airbox and factory velocity stacks if you have then, just open up the filter box to increase breathing capability. Most just drill some holes in the back of the airbox to allow more air in for better breathing. You would most likely need to rejet afterwards.
