Super 44? Delta Flow Muffler; 2.25 in. Center Inlet/Offset Outlet; Case Dimensions 4 in. x 9.75 in. x 13 in.; 19 in. Overall Length; Aluminized Steel; Durable Fully Welded 16ga Aluminized Steel Flowmaster s Super 44 muffler uses the same Delta Flow technology found in our larger Super 40 mufflers. The Super 44 delivers a powerful rich tone and is the most aggressive deepest sounding highest performing four inch case street muffler we ve ever built! Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability. This product ships in approximately 1 days