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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Just be sure to put it after the cat and before the muffler. If you place it before the cat there is a chance you could get some codes.
I am going to say just the opposite and say put it before the cat. One of the main reasons to install this is performance. If you put it after the cat then you might as well not use it at all. Better yet get rid of the cats.