Exactly Eddie. That continuous roving fiberglass will cause it to get louder over time. It's gradual to where you don't notice it until one day, you catch yourself turning the volume up higher than usual.
Don't believe it, let someone hear it now, and then wait about a year and let them hear it again. First thing they will say is damn, you put louder mufflers on your truck. This is what happened to me with the Dynomax.
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