On the rear, passenger-side of the S4 N/A extension manifold, there are three hose barbs. The one on the driver's side is covered by a large nipple. The one in the middle goes up to the thermo device that controls the secondary throttle plates. Fine. Where does the one on the passenger-side go? All the ones I've seen on all the extension manifolds I've seen (out of the car) are at a right angle with the opening pointing up. And I just attached my upper intake to my engine and that barb is the only mystery to me. Please help!

 

Didn't someone say that "mystery" third one was for the cruise control system a couple of weeks back?

 

Son of a... you're absolutely right. No wonder it was a mystery, I didn't put the cruise control in yet. Thanks Wayne!