aFe 49-44050 Mach Force XP 3" - 3-1/2" Stainless Steel Exhaust Y-Pipe for GM Silverado/Sierra 1500 (Non-CARB Compliant) 409 Stainless steel, True 2 into 1 mitered merge collector, Mandrel-bent 3" piping transitions into single 3-1/2" piping 49 state-legal, 400 Cell High-Flow Catalytic Converters, Increases flow results in better performance, High quality OE-style flanges and band clamps are used for a complete 360 degree sealing; GM Silverado/Sierra 1500 09-13 V8 (GMT900) with cats OE sensor bung, OE-style bayonet hangers and flanges, No Modification to stock system, Pair with aFe's Twisted Steel headers for even better flow-through for additional performance, horsepower and fuel economy; combo (P/N 45-00102) This product is not legal for sale in California or use on vehicles registered with the California Department of Motor Vehicles Manufactured and assembled in USA