Cummins ISX15 3689250 Center Exhaust Manifold PAI 181066CROSS REFERENCE: 3689250 3683788 APPLICATION: Cummins ISX15 BRAND: PAI 181066 Cummins 3689250 center exhaust manifold PAI 181066 manages exhaust flow. Truck engine rebuild and diesel performance parts deliver consistent 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 new with