The only ones that really, truly qualify as deep and throaty on our motors is the Hard Krome Sideburner.
This is because it is a very large diameter, fat pipe. Most everything you come across for a Freedom motor will be fairly skinny. Many will have a raspiness to the sound as well.
You'll find plenty that sound good, plenty that are loud (I really like the Conquest Customs Octanes), but the only ones I know of that have that muscle car, deep & throaty, rumbling sound are the Sideburners. They sound amazing, but the downside is that they are not the most attractive pipes to most folks.
Your bike came with the Slashness pipes standard (you have my favorite Vic by the way), which are quieter than say, the RPW Slash pipes that I have. The RPW's are shorter, so they are louder. So just keep in mind that aside from the Sideburners, the shorter you go, the louder they get.
2012 HD Road Glide Custom - Black denim