 The tube enters the intake manifold via a 90 deg kink from the right side and comes from a steel tube coming from the other side of the engine. Slightly less than half an inch outer diameter..
-99 4/4, 1.8 Zetec, Indigo Blue, 2-seat, Suplex RS
-04 Citroen Pluriel, 1.6 Sensodrive, Met Orange
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