I just installed these 92$ brand slip on mufflers on my 2016 Iron 883 - They are branded TJMoto but the same mufflers are being sold under different brands on Amazon for the same price.
I think they sound amazing and they are loud. Exactly what I was hoping for.

Here are 30 second clips of the stock mufflers v. these new mufflers.
No talking, no music, just the exhaust.
At about 15 seconds I rev a few times to between 2900-3100 RPMs.
My bike is stock except for Nightrider XL-VIED-14 running at 50%.

Stock - TJMoto Slip Ons -

 

Dang, I'm impressed! Sounds really good

 

They do sound good on that clip, it will be interesting to see how the welds, mounting brackets, internals and finish hold out over time.

 

Nice sound for a $92 upgrade- cant go wrong - Looks nice too. Great find!