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Originally Posted by Jaak
It's king of hard to compare both systems in any of the drawings I have seen. maybe someone who has worked on both can add to the discussion.
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picture below shows side by side of the intake plenum. the part that I was focusing in is the additional butterfly in the plenum in the "T".
it's opeation is controlled by electronics and vacuum. I don't think 986 ECU has this feature and therefore compatibility problem