[alex.s]

Originally Posted by DaBlue1

The snorkel meters the airflow for the low and midrange as well as smooths the air entering into the box so that it resonates softer. It's designed for better fuel consumption/HP in the midrange. The airbox alone is more than capable to flow enough air for the cylinder size of the bike and has little or no effect on peak hp at high rpms (providing the jetting is correct).

Shimming means more fuel, more fuel demands more air. That's why the bike responds better when you shim and remove the snorkel.



A little something to read about airboxes-http://motorcycleinfo.calsci.com/Airboxes.html

"Whenever air flows past something, like the walls of the inlet snorkel, the air touching the walls will stick to the walls and not flow. The air very close to the stuck air will flow, but sluggishly because the nearby air isn't moving. Thus there will be a region of air right next to the tube walls which does not flow easily. This area is called the Poisson stagnation region, named after the French physicist who first described it mathematically. The faster you try to flow air through the tube, the thicker the stagnation region gets. In a narrow tube at extremely high flow rates, the stagnation regions can grow to pretty much fill the tube and the flow through the tube can get slowed quite dramatically."

i think he said that it runs better with the snorkel in.