The uni and pipes did it.
The length of the track from carb to intake valve is calculated along with the variable for the stack. The stack smooths the harmonic balance of the air to improve atomization. Its a happy medium, tuning for the sweet spot. On our bikes you would tune the stack(s) to probably 4500 that would give improved balance in a range up and down of about 1000 RPMs meaning from 3500 to 5500 you get better atomization. Most tune to midrange. At WOT its usually a gas thing that runs you out of power not atomization.
Anyhow, in my humble opinion, putting a stack in a box prior to the carb on the wrong side of the filter does absolutely nothing. Once the air leaves the stack and enters the box the balance is gone.
Your airbox functions like a velocity stack. The volume of air outside the filter has been calculated by the engineers to feed the right harmonic balance to the intake.
