This two chamber design incorporates Flowmaster's patented Delta Flow technology. The Delta deflectors generate increased scavenging for better performance and reduced interior sound. Milder exterior tone and reduced interior resonance over Original 40 series. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability.Automotive Item Grade: High PerformanceBody Height: 4.000 in.Body Length: 13.000 in.Body Width: 9.750 in.Color: BlackFitment: UniversalInlet Connection Type: PipeInlet Diameter: 3.000 in.Inlet Inside Diameter: 3.000 in.Inlet Outside Diameter: 3.000 in.Inlet Position: CenterInlet Type: Single CenterMain Piping Diameter: 3.000 in.Material: Aluminized SteelMount Type: Uses New Hangers (Not Included)Muffler Series: 40 Series Delta FlowMuffler Type: ReflectionOutlet Connection Type: PipeOutlet Diameter: 2.500 in.Outlet Outside Diameter: 2.500 in.Outlet Position: DualOutlet Type: Dual OutletOverall Length: 19.000 in.Shape: OvalSound Level: AggressiveTip Quantity: 0Title: Flowmaster 9430402 40 Delta Flow Muffler - 3.00 Center In / 2.50 Dual Out - Aggressive SoundWARNING CA Proposition 65: No