Hello, I am new here. I am glad I found this forum. I am looking to find me a new truck, and I was thinking of buying a new 2011 3500 but I have heard that they will be almost impossible to mod as far as exhaust goes. I would love to go 5" with a 6" tip like my old 02. Does anyone know what they get as far as mpg? I have also heard that they run like dogs because or all the new standards. So if anyone can kindly fill me in that would be awesome.