Did you find there was a huge difference in sound (both tone and how loud it is) before and after the X pipe and cat removal? I was reading that some people thought on the fox bodies that once the stock H pipe and cats were removed volume became a problem. Of course what is too loud for one isn’t loud enough for the next so its hard to tell.
I think I am going to start with the Flowmaster cat-back system and shorty headers and leave the stock H pipe/cats alone for now. If I find that isn’t as loud as I was hoping for then I can always disable the smog system and get the after market H pipe with no cats at that point. Now hopefully the guys and LMR.com are right when they said the parts will fit with the stock H pipe.