Well, got her put back together and tuned up. I think the matting definitely helped with the rattles. It's not a million dollar sound but, realistically, it is a UTV.

Made a video for you guys, nothing staged, no edit, just winged it. So no b******g.

First part of it was at low volume for quality, sounded great in the machine but noticed in the video that the sound from the mic is fluctuating.
Second part of it was what this system was built for, a guilty pleasure.