The Flowmaster 943045 Super 44 Series Chambered Muffler uses the same Delta Flow technology found in larger Super 40 mufflers. The Super 44 delivers a powerful rich tone and is the most aggressive, deepest sounding, highest performing 4" case street muffler Flowmaster has ever built. Constructed of 16-gauge aluminized steel and fully MIG-welded for maximum durability.• Race-proven Delta Flow technology• Noticeable interior resonance• Deep aggressive sound exhaust note• Recent two chamber improvementSpecsBody Dimensions: 4"H x 9.5"W x 13"LBody Material: Aluminized SteelInlet Connection: Slip-FitInlet Inside Diameter: 3"Inlet Outside Diameter: 3.13"Muffler Overall Length: 19"Inlet Location: CenterOutlet Location: CenterOutlet Inside Diameter: 3"Outlet Outside Diameter: 3.13"Sound Level: AggressiveFit: UniversalVehicle Type: 4/6 Cyl. Engine, Muscle Car, Street/StripPart Number: 943045 Most aggressive, highest performing 4"" case street muffler Constructed of 16-gauge aluminized steel Fully MIG-welded for maximum durability