I'll try to look up what resonator came with their catback, if I can even find that info. The mufflers towards the tips may play a part in that too. That may be an option for you too, replacing the stock mufflers with something like Borlas or Magnaflows.
You know jason i have tried soo many exhaust parts. I guess i can't find an exhaust system on this car that i am happy with.
I have msds y-pipe, stock y-pipe and bat y-pipe in my house. Magnaflow resonator and dynomax mufflers all at one point. Swapping things back and fourth just to find the right sound.
I guess i gave up and put almost everything back to stock. Except the headers and msds y-pipe.