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At the end of your air cleaner tubing where it attaches to the crossover portion of your manifold is a butterfly valve (resonance flap); beneath your intake manifold is the EGR flap. Both control airflow.
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Terry Allison
N. Calif. & Boca Chica, Panama
09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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