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Yes, I believe the throttle bypass valve better allows the extra fuel that is typically of CIS to be more burned in the combustion chamber than in the turbo or exhaust system. Sometimes sending fuel down to the turbo turns it into a jet motor which can be good for spool but bad for the life of the turbo.
Mark, I am not sure that disconnecting the vac line will tottaly disable the TBV. If there is enough of a boost spike between shifts (effectiveness of the CBV) it still might be pushed past to some degree. Just a guess.
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