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My 81 has the extra port. Your routing has the same effect, flow of metered air from before the throttle to after the throttle across a venturi tube, to provide a reliable vacuum for the brake booster. The hosing at the AAR changed when the new port was added, which makes for a slightly neater arrangement and less hose overall; on my car the hose goes straight down to the extra port instead around to the AAR hose. BTW, it shouldn't be a T to the brake booster; it should be more of a Y-shaped tube with the side port going to the brake booster.
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81 928S Euro 5sp, 03 996TT X50 Tip, 02 Z3M S54 5sp
past favorites: 99 M3 E36 5sp
Last edited by Luis_M; 04-28-2012 at 08:23 PM..
Reason: add detail on venturi tube
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