I have Remus Gran Prix cans on my DL1000. Medium Loud, no silencers, very nice mellow sound - I love them!
So I bought a Remus Revolution can for my AN650. This model takes the "removeable silencer" approach. NOT as nice. With the baffle in it sounds almost stock. I bought the can so the AN650 would NOT sound stock. With the baffle out, it is louder than a straight pipe Harley - very harsh sound - I couldn't stand it. I had to modify the silencer. I cut off the back 3" which was the most restricted part & reinstalled the silencer. Fortunately, I got a sound I can live with - but nowhere near as nice as the unsilenced Gran Prix's. So after this experience, I am leery about the "removeable silencer" type of cannister. I would want to know how the Devil can sounds with the silencer out. If I didn't like it - I'd buy a different brand.
The other issue with the Remus Revolution was that with the silencer removed, it left a HUGE opening. Fattest rodent in the World could crawl in there. Also, since the can is upswept, I was concerned about excessive water getting in when washing or parked in the rain.
I can't say for sure that the Devil can will have the same issues as the Remus Revolution - but I suspect that it might.