You do realize that video had the stock headpipe with the cat still in it, you have changed yours to a no cat, now granted the mufflers did sound good on that video, it might be louder on yours with no cat but I think you can add more discs or subract which ever the case to get the sound you want, I would think anyway, fuelmoto could say or even Kevin could tell you.
All for now Trampas
On my 2013 TriGlide I ran the E Series exhaust and had no cat in the header and it definitely is not loud. A bit louder than the stock pipes on my 2018, but still very mellow especially when going down the highway. I had Street Cannons first and hated them (too loud for me).
I'd put them on the new trike but I don't want to void the warranty just yet since I've only had it for about 9 months. You're right in that you can change the number of discs to help with the sound, but if I remember right, that also changes how much torque you get. I think it was less discs for more torque, but I'm old now and can't remember for sure.