So I just deleted the 3rd cat and resonator. I replaced it with a preformed X. The sound is perfect for me. A slight gurgle outside the car on decel. No drone at all. Butt dyno says it's good. I data logged before and after on the same day as it only took about an hour at my shop. Haven't had a chance to look at the logs yet. Came out clean. Those stock mufflers sure are quiet. Took it on a 45 mile trip and no drone inside. Very happy with the result.