How old is your exhaust, Sean? I'm with Wolfgang. I suspect your glass pack done packed up and left.
From the looks of it, you don't want to put OEM tailpipes on it, I think they'd be too restrictive. OTOH, an appropriate length pair of these might work. https://www.appletreeauto.com/...QOUwL8RoCs5oQAvD_BwE
Are your tailpipes open? That could be amplifying the noise. As for baffle inserts, I did that to mine. It didn't so much make it quieter than it changed it to a more pleasant note.