In my old '02 4runner, i ran the tube behind the rear bumper, up the side of the rear cargo door, and into the rear taillight housing. I am not sure if this is still possible with the 4th gen 4runner or not. I like this because the breather is completely protected behind the housing and it is in a high place.
Check these links out:
http://www.toyota-4runner.org/showth...=&threadid=123
http://www.toyota-4runner.org/showth...ntial+breather
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