MagnaFlow glasspack mufflers are reversible in design and feature a straight through design for maximum flow and minimum restriction. Built with a single stage packing these mufflers bring back that classic look and traditional glasspack sound. PartNumber : mag18129 Description : Muff GP 4 Dia 18in. 3/3 Main Piping Diameter : 3 Material : Aluminized Muffler Body Height : 4 Muffler Body Width : 4 Muffler Body Length : 18 Muffler Overall Length : 22 Muffler Body Diameter : 4 x 4 Muffler Body Material : Aluminized Muffler Body Finish : Aluminized Muffler Body Shape : Round Muffler Configuration : Center/Center Muffler Inlet Diameter : 3 Muffler Outlet Diameter : 3 Muffler Type : Glass Pack Tip Quantity : Warranty : N/A 614 : 4 616 : 4 615 : 18 52 : 4 x 4 621 : Aluminized 200 : Aluminized 33 : Round 601 : 3 622 : 3 1174 : Glass Pack 1161 : Body Height (in.) : 4 Body Length (in.) : 18 Body Width (in.) : 4 Inlet Connection Type : Pipe Connection Inlet Position : Center Inlet Size (in.) : 3 Inlet Type : Single Center Inlet Main Piping Diameter (in.) : 3 Material : Aluminized Steel Muffler Count : 1 Outlet Position : Center Outlet Size (in.) : 3 Outlet Type : Single Center Outlet Overall Length (in.) : 22 Shape : Round Body Material : Aluminized Finish : Aluminized Inlet Inside Diameter (in.) : 3 Muffler Body Diameter (in.) : 4 x 4 Muffler Overall Length (in.) : 22 Outlet Outside Diameter (in.) : 3 Outlet Inside Diameter (in.) : 3 Title : Universal Muffler WARNING CA Proposition 65 : No California Proposition 65 : WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov Body Height : 4.000 in. Body Length : 18.000 in. Outlet Inside Diameter : 3.000 in. Outlet Outside Diameter : 3 Body Height : 4 Body Diameter : 4 x 4 Body Length : 18 Inlet Inside Diameter : 3 Body Width : 4 Exhaust Tip Quantity : Outlet Inside Diameter : 3 Inlet Inside Diameter : 3.000 in. Exhaust, Mufflers & Tips::Muffler