14. After dropping the oversized air filter into the box, the open end was slipped onto the inlet tube. The coupler slips all the way through the heat shield and mounts with a hose clamp from the outside of the box. It’s a simple design that holds both the tube and filter in position without the need for an adapter and additional silicone couplers. A hole was preset in the heat shield to accept the breather tube. Using the nipple from the kit, we mounted the tube into place.