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Hey Forum, I have been looking online at the different exhaust systems out there available for the 2014 5.3L, and they are more expensive than I though. For example, Flowmaster's Outlaw system is $850 just for the parts. So, I called a custom truck shop near town and they stated they would be able to cut off the muffler and take out the remaining pipe after the muffler. After the third cat, they would install a Y-pipe and run the exhaust out of the rear corners with 4" tips for $325 installed. I looked up several videos on YouTube where others have done this and the setup sounds good to me. My concern is, after removing all the restrictions after the third cat, will there be a decrease in MPG or HP due to the lack of back-pressure? Or, an increase? I do not understand the back-pressure concept so I am out of my league when it comes to exhaust knowledge.