I'll have ported manifolds, no cats, down tubes, flowmaster resonator, and flowmaster mufflers. All piping 2.25" except after the resonator it is 2.5" back to the split.
I have 2-1/2 downtubes with 1 3" hi-perf. cat as a REZ then back to 2-1/2 into the 2 chamber 40series Flowmasters...I have been told on many ocassions that it sounds like it should not be on the street...I like it, and it resonates less than my Magnaflow setup on my 94SC...Both sound the bizz though...
I think you are gonna like it...And if you have a lopey CAM you are gonna LOVE it....