Well, I had my center resonator and x pipe assembly replaced with a magnaflow dual inlet/outlet unit that has an internal x pipe in an effort to quiet down the exhaust just a touch.
The new sound is maybe a little cleaner than the stock resonator, but is louder. I didn't expect this, considering the straight-thru design of the stock resonator and the new packing in the magnaflow, but it is louder. The magnaflow is shorter than the resonator though, so I do now have room to possibly add some 4" round magnaflows as well just after it.
I have realized a fair reduction in weight by removing the back boxes and replacing the resonator. This has been an effort though to get a nicer sound from the exhaust, comparable to a tubi, at a lesser price. With all the custom work done to this point I am inching closer to the tubi price all the time...