P0491 p0492 bank 1 bank 2 secondary air injection

[Seal Grey Sasha 986]

Hey guys, I've had secondary air faults for a while now and have more or less been putting diagnosis off. I know there is no electrical fault, as you can hear the pump kick on and off as it's supposed to. My next step would naturally be to smoke test, but I'm seeing a discrepancy in the diagram shown in my Bentley manual and the system in my car. The diagram shows the check valve that is installed in the intake has a single vacuum line that runs to the vacuum canister, however the check valve in my car has a "t" coming off. One line leads to the canister, and the other line leads nowhere. The line is routed over the transmission towards the bank 2 side, and other end is simply open, not connected to anything. I can't seem to find any diagram showing a system with this extra line. Has anyone ever encountered this setup, or has someone done a repair with improper parts? I'm a BMW tech, but my Porsche experience is limited to working on and modifying my own car. Any help would be appreciated...