If you are going to put on true dual headers and a high flow breather you will have to re-map the stock computer or your bike will run too lean. Here's the good news. If that is all you are going to do you do not have to go to a high dollar tuner. The Vance and Hines Fuel Pak or something similar will work just fine. If you go to different cams or head work later, then you will need a tuner with more adjustability.
Most of the name brand headers are good. I have had V&H and Rineharts on my last two TC scoots. I really like the V&H Power Duals I had on my Ultra with their 3.5 inch slash cut mufflers. But any of the true duals made for a 2010 or newer TC touring will work on your 2015. If money is a concern, look at Cobra or Python, they have quality true duals also. I believe Python is produced by either V&H or Sampson.
Just my 2cents
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2017 Lagauna Orange FLTRX, 2013 Candy Orange Road Glide Custom (traded), 2010 Ultra Classic (traded), 2004 Classic (sold to little brother), 1999, Classic (traded), 1999 Road King (best handling so far), 1994 Softail Custom (traded), 1974 Superglide (I miss her still).