I’m considering valvetronic mufflers. There’s a decent video on YouTube demonstrating them on a 3v 4.6.
Went to an exhaust shop and they said they’re actually very good despite them being sceptical for the first couple years. Apparently they’re making the valves for a lot of OEM exhausts now. He said about 10% louder than oem mufflers with valve closed and straight piped with it open lol. Quite the split personality.
Only downside as far as I can tell is they quoted me over $2,200 installed (Canadian pesos), not cheap. They have a vacuum box that needs to be wired into the fusebox or use the 12v plug in the dash or glovebox so install is a little more involved.