There's definitely noise from the cutting but I think most of it is from the howl of the air exhaust, plus my compressor which is a bit on the noisy side as well.
Popular bit of kit back in the day on fire engines, used to run them off a BA set air bottle. When the fire service replaced them with more modern kit the old Cengars ended up on the surplus market so we bought them for the rescue ambulances and carried a couple of air bottles in a frame to power them.