Parts & Accessories Spare parts Sierra Cat-back - Silverado bumper outlets (Agency) Model 2019 - 2026 Features and specifications of the BTM Cat-back for GMC and Silverado: - Muffler size is 3 inches. - Muffler valve thickness is 4 mm (highest thickness compared to usual valve thicknesses). Benefit: stronger resistance to throwing and cutters. - BTM Cat-back with the device (electronic) 3 inches. - One-year warranty on welding. - Made of 304 stainless steel and fully TIG welded. - Increases engine performance and horsepower. - Compatible with Sierra and Silverado models from 2019-2026 (Reason for selling: Selling the car)