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First Lets get this out there the new bikes sound like ****. I know I have one. Answer to your question, no matter what you do short of a big build its going to sound like **** if you are looking to compare it with the older engines. On my 2019 Ultra Limited I put R/C mufflers on, better sound still ****, so then I de catted the header, put a big sucker air filter on with a power vision now its starting to sound better not what I would like but better. So just about any after mufflers will give you better sound than screaming eagles ****.
S&S 475 cam will give you the sound you're looking for.