who's running stacks on there cummins also any sound clips. my MBRP 5" turbo back is a little quite and iam thinking with the new wheels and tires it will look better with the stacks :devil:

Stacks are for looks. 4" straight pipe will make as much if not more power.

I have stacks on my 99.. Also have done several installs on CR Cummins, as well as Fords and Chebbys..
Heres an 04
http://www.pt-motorsports.com/images/Trucks01.jpg
Here is mine:
http://www.pt-motorsports.com/html/images/about.1.jpg
They basically sound just like a straight piped 4" system, it just sounds louder since the exhaust exits right behind the cab..