E46Fanatics - View Single Post - DIY: OE Oil Separator alternative --> E39 M5 OS
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Old 05-11-2012, 11:17 AM   #13
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Originally Posted by fadeaway View Post
Instead of creating a brand new aluminum fitting between intake boots, would it be absolutely absurd to Y-pipe into the vacuum fitting or whatever that thing is on the lower intake boot?
Upper or lower? Either way, I think so.

The upper has the 'F' tube, which constantly breaks and is too small for the oil fumes and would clog quickly.

The lower has a 'Y' that connects to the idle air control valve.

Either way, your having to connect rubber-to-rubber. I've done this for my catch can, and it never works well or for long.

The custom adapter is the best way to do this. You ***might*** be able to modify the OEM plastic piece between the upper and lower boots with a plastic adapter piece to make it work like this custom adapter.
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