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That's the decel valve.
Yes, there is a hose that connects to the middle nipple. If memory serves it runs to the throttle body. This valve is not manditory. It allows the engine to decellerate slowly when the throttle is abruptly cut.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
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