Umm WTF.
But straight pipe and side exit before rear tire. Remove all rubber isolator hangers and wield the exhaust to the body that should add some "sound".
They are only free as long as you post pics of them on your toys. Lol
If you need help putting then on here is my old DIY
http://www.duramaxdiesels.com/forum/showthread.php?t=16216
I wear glasses so 3D sucks for me as I cant see shit. I don't like that some places are not only showing in 3D unless I want to go see it at 1pm (I work and have a life so not going to happen ever) so I don't go much now.
I hear it all the time.
My old 95 3509 had a Dana 110 rear axle. The owner said it was stock. It was no stock as the VIN said it should have a Dana 80. I never believe what people said. Also people don't seem to know the difference from factory equipped and dealer installed.