My understanding is that the hole in the factory air filter is intended for the breather hose which runs directly from the external power jet (near the top of the backside of the carb). The two breather hoses that sector160 is asking about (i.e., the one that connects at the top of the cylinders, and the one that connects to the isolator next to carburetor) both exit to free air. I routed these two hoses next to each other through the base of the right side carb cover cutout (see attached pic.) From there I routed them down in front of the swingarm and rear brake pedal, then let them hang just slightly below the frame.
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