Mack 104GC5213M Center Exhaust Manifold PAI 1779CROSS REFERENCE: 21010779 25100116 25099961 104GC5202M 104GC5213AM 104GC5213M APPLICATION: Mack Aset Multiple Use Application. BRAND: PAI 1779 Mack 104GC5213M Exhaust Manifold PAI 1779. Aftermarket parts and truck parts. Ensures proper exhaust routing and supports thermal stability during service. 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