Your options for true duals are as follows (ask me how I know, been looking into it forever, lol)
You can buy a complete system from Rinehart, Bub, or Freedom Performance (Just to name a few)
These companies make systems now that have one pipe on each side like the older bikes, or you can get the systems where on of the cylinders crosses under the bike over to the other side.
Then you also have the choice of buying a True dual header from someone like Dragos, Rush, V&H, or Freedom Performance, and then you pair that with the slip-on mufflers of your choice. These pipes however cross under the frame from the left to the right except for one of the two setups from Freedom performance (if I'm not mistaken).
The complete systems usually have a larger than 1 3/4 inch diameter and can't be used as an exact fit with the standard slip ons on the market which have an 1 3/4 inch inlet diameter. There are companies that sell adapter kits, but in my opinion if buying new there's no reason to buy a complete 2" system just to swap the mufflers.
Here are some link to start getting you going crazy:
Then just some headers:
I will add here that the Rush and Dragos true dual headers are ceramic coated inside and out and for the same price pretty much as the other systems.
Something else to take into consideration will be your tuning needs, if you have a new bike and want to use something with an auto tune like the Thunder Max for example then you will need a system with the larger 18MM O2 sensor bungs, the newer bikes come stock with 12MM O2 sensors. If you just want to be on the safe side you can buy headers that have both like the Dragos, or if I'm not mistaken the complete Rinehart systems also have both sizes. Then no matter what tuner you switch to in the future you have your bases covered.
I'm pretty sure I missed something, if so someone more knowledgable than I will chime in and add to this. I'm no expert but for the last almost 2 years of my life with motorcycles I have been fighting with whether to switch to True Duals or go with a 2-1-2 (X pipe) system or a 2-1 with a Ghost pipe. I can understand the performance differences, but like you said, nothing freaking sounds like duals.
I traded in my Ultra not long ago on the CVO Road Glide, and have been fighting with this decision for this bike too. Every time I think I have made up my mind I read something on one of the forums and I'm back to square one.
I hope this information helps you more than it confuses you. If I can be of anymore help feel free to ask here in the thread or send me a PM.