The previous owner of my car installed a RMR intake pipe. I was taking it off this afternoon to do a boost leak test and noticed a black fitting that was sticking out of it but was not connected to anything. I blew air through it and it flowed freely through it. I was wondering if any one knew what this fitting is meant for?

Picture is attached for reference...

 

Its used as a vacuum source for the stock breather tube from the right side of the valve cover. Most people use it as a vacuum source when installing a catch can setup using a closed loop design.


*Keep in mind that this image is mirrored.

 

Ah thank you!! The PO had the breather tube just hanging off to the side...Should I attach it to that fitting then? Is it doing any harm not being attached to it?

 

It wouldn't hurt to attach it. Some people just take off the tube and run a breather on the valve cover as well.

 

Thank you kindly!