Description: 1/2 ton, std cab, 5.3l with 6.5 ft box. Silverado, sierra. 5.3l. Without flex fuel. 119 wheelbase. Has the necessary components to service your vehicle's exhaust muffler Helps diminish the amount of noise emitted by your vehicle's exhaust system Helps guide exhaust to the exterior of your vehicle This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors