Cummins ISX 3689251 Center Exhaust Manifold PAI 181069CROSS REFERENCE: 3689251 3685284 3687062 APPLICATION: Cummins ISX Multiple Use Application. BRAND: PAI 181069 Cummins ISX 3689251 Center Exhaust Manifold PAI 181069. Heavy truck parts and OEM replacement parts. Controls exhaust pressure balance. 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