Cummins 6B 3931744 Exhaust Manifold PAI 181031CROSS REFERENCE: 3916345 3921704 3922728 3931744 APPLICATION: Cummins 6B BRAND: PAI 181031 Cummins 3931744 Exhaust Manifold PAI 181031 heavy truck parts and heavy duty truck parts. Ensures stable exhaust direction and maintains engine performance. All components are proudly manufactured in the U. S. A. by PAI Industries Inc., an ISO9001 certified company with over 50 years of experience in the heavy duty truck parts industry. This part is built brand