Cummins ISX 3685999 Front Exhaust Manifold PAI 181051CROSS REFERENCE: 3685999 APPLICATION: Cummins ISX Multiple Use Application. BRAND: PAI 181051 Cummins ISX 3685999 Front Exhaust Manifold PAI 181051. Diesel truck parts and commercial truck parts. Maintains exhaust direction. 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 premium