Grand Rock M536 Muffler Oval Type 2 - 8.25 x 11.5 x 32, Connections 3.5" ID and 4" ID - Nelson 86536M, Donaldson M090680, Heavy Duty Manufacturing 31142
Grand Rock M537 Heavy Duty Exhaust International DT 466 Type 6 (End In / Side Out) Muffler - Horizontal Outlet, 3.5" ID Inlet, 4" ID Outlet, 32" Body Length, 35" Overall Length, Navistar International 1648000C2, Donaldson M090547
Grand Rock Heavy Duty Exhaust Ford Type 6 (End In / Side Out) Muffler - 5" ID Inlet, 5" ID Outlet, 11" Body Diameter, 36" Body Length, 39" Overall Length