Super 44? Delta Flow Muffler 3.0 Center Inlet/2.5 Dual Outlet Case Dimensions 4 x 9.75 x 13 19 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 have ever built. Constructed of 16-gauge aluminized steel and fully MIG welded for maximum durability. This product ships in approximately 1 days