09-13 GM P/U 1500 5.3L Cat Back Exhaust Kit Radiators the sound is further enhanced

the sound is further enhanced into a smoother

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including a Helmholtz chamber and single-channel absorption increases flow while reducing unwanted noise and weight

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reducing parasitic drag on the engine for a 6 HP @ 8000 RPM and 4 lb-ft torque @ 8000 RPM gain on a stock vehicle

09-13 GM P/U 1500 5.3L Cat Back Exhaust Kit Radiators the sound is further enhancedExhaust System FlowFX Cat Back 2. 5 in Diameter Side Exit Dual 4 in Black Tips Stainless Natural GM LS Series GM Fullsize Truck 2009 13 Kit