DNA Motoring YP-370Z-G37 Stainless Steel Y-Pipe Downpipe Exhaust Made of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends for Strength and Durability Dyno Proven Increases Low End Torque and Horse Power Aggressive Deep Sound while Ensures Smooth Exhaust Gas Flow O2 Sensor Bung Insertion and Gasket Included Inlet: 2.5" / Outlet: 3" / Piping Diameter: 2.5" with Welded Flex Pipe