Cummins 6B 3901683 Exhaust Manifold PAI 181030CROSS REFERENCE: 3863107 3901683 3931747 3970066 APPLICATION: Cummins 6B Multiple Use Application. DETAILS: Manifold Exhaust High Mount Front Output BRAND: PAI 181030 Cummins 6B 3901683 Exhaust Manifold PAI 181030. Replacement truck parts and aftermarket truck parts. Maintains exhaust routing and engine function. All components are proudly manufactured in the U. S. A. by PAI Industries Inc., an ISO9001 certified company with over 50 years of