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I can't remember but someone said what that air line was put there for. Myself I put a chuck there for an air hose.

That is to be used in extream emergencys. That is the cab boost line and the line to the intake manifold is not hook up. In extream emergencys like you need to double your speed or your passenger has diarrhea they can open it up and it gives you 110 lbs of boost. It is a one time use only...