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I drive a 2014 Silverado 1500 4x4 crew cab & often tow a toy hauler. I'm looking at all performance options: throttle body spacer, programer, etc. I have replaced the air filter with a K&N & notice a difference, but before forking over the $$$ I'd like to know if a CAT back will make an improvement.
 

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Tuner, long tube headers, CAI and exhaust should build you roughly 45-50 hp in a 5.3 or 6.2. Most of that is probably the headers and tune. I've never really had much faith in exhaust for performance, besides removing any sever bends or crimped/restricted sections. But in a nutshell Backpressure= bad pressure. I personally will never fork out $800 for an exhaust system. I'll just straight pipe it myself if I want performance.
 
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