Quote Originally Posted by khung88876 View Post
What tylerbinski is saying is you can just put a filter there, but some disagree doing that, it WILL allow unmetered air in. http://www.grandprixforums.net/has-a...e-2-46116.html Not big deal to me
You have no option in a turbo setup but to open that to free air and tune for it or over the oil cap. You do have an option in a S/C or N/A setup and there is no reason to put a breather there unless you are running and intercooler which blocks the passage.