I have a 2.5" catback with LaBree (Sebring) mufflers which I love. I've had the 3" to 2.5" resonated TP for over a year and that combined with my catback just didn't seem to cut it as far as how quiet I wanted it to be. Specifically, the drone was a real annoyance to me so I decided to install resonators in my X pipe. 3" - 2.5" resonated TP with unresonated Z pipe;

Labree (Sebring) 12" resonators;

Newly installed resonators into X pipe;


I now can enjoy a lengthy trip on the highway without that annoying drone or exhaust note.
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