Exhaust Manifold for Cummins 5.9L 6B ISB QSB B5.9 Please review the images / compatibilty to ensure you are ordering the correct part! Replaces Part Numbers: 3922728, 3931744, 3921704, 3916345 Engine Codes: QSB5.9, 6B5.9, B5.9 G, B5.9 GAS PLUS CM556, ISB CM550, ISB5.9G CM2180.
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