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A catch can on the vacuum side will do a better job reducing carbon build up than on the boost side. This is because your engine is in vacuum mode like >90% of the time, and the vacuum side PCV dumps right into the intake runners in the cylinder head. You don't need to plug the holes in the cylinder head when you "externalize" the vacuum side PCV, but it doesn't hurt.
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2013 135is DCT Carbon Black Metallic
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