I wonder if a can of spray foam insulation would help.
I have Black Widow "Neighbor Hater" mufflers on a cammed 392 in my 300. Of course I moved now and dont have neighbors for a few hundred yards... But when I had neighbors, it was fun.lol, I’m “that guy”. My TRX tailpipes point directly at my neighbors’ bedroom window when I fire up at 5:30am each morning.
In fairness, I warned them before they bought the place
I parked backed in. I used to think that would make cold starts on my truck quieter. Then I realized the sound bouncing off my stone garage wall probably enhances itI have Black Widow "Neighbor Hater" mufflers on a cammed 392 in my 300. Of course I moved now and dont have neighbors for a few hundred yards... But when I had neighbors, it was fun.