I believe that hose is used in conjunction with the newer 964{??} style blow off valve, as that is a copy of the 964{??} style elbow hose.
That style blow-off valve is attached at that small top opening on that Fabspeed red hose.
You would then disconnect or block off the old sliding piston re-circulation system that is on the base of the stock 930 intake manifold.
Others will correct me if I have my head up my ass...:}
Mark
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