I have the metal muslisha exhaust on my 2014 and it's loud and deep sounding. The six inch exhaust tip grew on me after a while.
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I have it on my 5.3 and love the sound, it's a 4 inch exhaust for my truck also. I really like the way it sounds. I also have a range device to disable AFM.
I installed the metal mulisha exhaust on my 2014 and don't noticed anything different as far as performance. But also I only have a 100 miles since. Gibson says it takes 4-500 miles before the computer adjusts to it.