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B goes to the wastegate actuators & comes from the original control valve on the offside strut.
 

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So, do l block off pipe 'C'

The tail 44mm wastegate has two banjo/unions, do l use both or block one of them off.
I think "C" just went to the induction pipe ( between AFM & turbo ) & just sucked fresh air. I attached a length of hose & blew down it to find where the other end was! I think (from memory) I just blanked off the vaccum pipe on the plenum & left "C" open. It all depends what type of actuator you have on the turbo.
Here's a link to the Profec B manual which explains the different types of actuator & how to plumb them in. :thumbsup:

http://www.alamomotorsports.com/greddy/PROFEC_B_SPEC2.pdf
 
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