Got a 2007 silverado 2500 HD Regcab long bed 6.0 v8
I dont kno much about this thing so i need some help finding out what the best engine mods are.
They dont make a cat back exhaust yet so i took the muffler and tail pipe off and put a flowmaster muffler on.
What else can i do?
And how different is my motor compared to the 6.0 in the GTOs
Thanks


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