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Replacing secondary air injection emission components

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I don't want to make this long story long (response: "then don't).  I want to replace the air change over valve, the SAI valve, the electric change over valve that's situated in front of the SAI valve and also the black/white check valve that gets attached to both the vacuum hose and a hose that ultimately leads to the air intake. 2 questions. Can I access the area to be worked by just removing the brake booster line, the resonance valve, fuel tank vent valve and alternator ? I must admit, I don't know if my confidence is up to par taking the intake tubes and throttle body off for easier access as the Bentley would have me do (wait !!! I think I just dropped a feather) Also, where would the black/white plastic check valve be located in relation to the air change over valve, SAI valve etc. I've seen pictures of it positioned right next to the throttle body but I'm not sure what model year 911 it was or if it was actually a newer Boxster.. I have a 1999 C2 manual. I have the air Box out and can see part of the distribution tube and just a very small part of what I believe is the SAI valve with attached hose from the injection pump. Will I have no other course than to remove the throttle body and intake tubes to replace this check valve or what ?  I have the Bentley book but was wondering if there's a McGiver type approach that anyone may be aware of. Any help in this would be Greatly appreciated.

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Removing the distribution tube is easy (figure 7 here http://www.pelicanparts.com/techarticles/Porsche-996-997-Carrera/09-ENGINE-Air_Oil_Separator/09-ENGINE-Air_Oil_Separator.htm )


I'm not sure if you can get away with removing the alternator only or plenum only though. The black/white valve should just plug into the left rubber intake plenum sleeve. Pics of the whole system here http://rennlist.com/forums/996-forum/849770-mkii-996-vacuum-line-routing-and-related-components.html


May as well replace the vacuum reservoir and all the hard tubing.

Edited by Ahsai
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