My exhaust has undergone several changes...
Started with a cat back system. Nice sound, not too aggressive. I then swapped the cat system for a setup that had 2 hi-flow cats and a y-pipe. No 3rd cat and sounded a bit better. Definitely flowed better.
But then I moved to Cali. The smog nazis busted me on the setup, and I had to put on an OEM cat system. I have both, so I can swap out for smog checks...
I then found the mufflers were rusting from the inside out, and yanked them putting in straight pipes, leaving the resonator. The catch though, is the resonator is on the hi-flow cat system, so when I run the OEM cats, I'm running completely straight out the back.
Surprisingly, it's not as loud as you might think, but will drone at highway speeds. As of right now, I was too lazy to put the hi-flow system back on, so it's.. um... quite aggressive sounding right now.
The extra cat does help tone it down a bit.
If you just cut the resonator and leave the mufflers, you'll see an increase in cabin noise on the highway. Not too bad, but definitely louder.