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so the 3 stage manifold had only one vent hose connection, instead of 2 like the stock manifold?
if that is the case, it means you got an E60 5 series manifold instead of a 3 series manifold. I had both of them side by side and they were exactly the same except for the number of vent hose connections.
Or are you saying you re-used the oil separator (softball thing under the manifold)? the 328i has this built into the valve cover so you don't use it at all with the new intake manifold, you should just connect the 328i vent hose directly to the manifold, and bypass it all together.
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