Being just a little pedantic, Sir Will, and begging your pardon for being so, but this is not a secondary air injection system issue with which this thread started (although the original poster did stray onto the variable manifold system problem that his investigations highlighted - possibly because the vacuum required to control the variable intake manifold and the secondary air system is provided by the same two vacuum reservoirs). I am sure that there is a considerable thread on the subject of VIM/actuators/arms elsewhere.
Erm, I'll get my coat....
By the way, I think that you are right about the cost of the links. Look forward to seeing your results 
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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