Grand Rock - Mack Truck Type 1 Muffler - 4" Inlet & 4" Outlet Type_Interior Accessories Choose from the drop down

Choose from the drop down menu

25P-EC70044CP

Mounting adapter item # 70603b and "challenger" pistol grip item # 70626 available separately

Limited Lifetime Warranty

Grand Rock - Mack Truck Type 1 Muffler - 4" Inlet & 4" Outlet Type_Interior Accessories Choose from the drop downGrand Rock Mack Truck Type 1 Muffler 4" Inlet & 4" Outlet Grand Rock Mack Truck Type 1 Muffler 4" Inlet & 4" Outlet Fits Most MACK Truck Makes and Models 4 Inch Inlet ID (inner dimension) 4 Inch Outlet OD (outer dimension) 8. 4 inch round diameter 41 inch length Sold Individually Made in the USA Grand Rock Company is a major manufacturer and warehouse of superior exhaust systems for the aftermarket. Since 1970 Grand Rock has had its sights set on