Here is an experiment to make the DragonFly stove quiter.

MSR DragonFly Stove (normal configuration with the typical roar):
  (You need to Login or Register   (You need to Login or Register
Parts borrowed from a Primus 111 stove plus about a 1 inch section of copper tubing inserted down the throat of the left (inside) piece to help focus the jet of fuel from the nozzle.
  (You need to Login or Register   (You need to Login or Register
MSR DragonFly Stove (with adaptation; normal deflector plate removed an partially visible to lower right).  Comparatively very quiet!
  (You need to Login or Register   (You need to Login or Register