i just cut my hose off and left it open...

 

no idel leak to be had from leaving that nipple off huh?

 

I'd think so since it goes directly into the intake man.. You might as well cap it if you have a cap.. or remove it and JB it.



One of my spare S4 intake mans actually has no sub zero location.. there must have been a model that did not have that from the factory.