Not sure why that E18 is so noisy. At a small club launch, I had one in an Aerotech Cheetah (which is in the sweet spot size wise at 1.9"), and when I lit it, someone commented "That'll wake the neighbors." It seemed louder than a 29mm F52 that I launched later.
Hans.
White lightning is just loud. The F52 was either Classic or Blue Thunder, right? Neither of those are particularly loud.