Your Sunday Morning Jet Noise

This should give you an idea of how the B-52 has evolved over sixty years:

The newer TF-33 turbofans still smoke, but nothing like those old water-injected J57s! There have been proposals over the years to re-engine the B-52s with four high-bypass turbofans for better range and fuel economy. That may still happen, since the B-52 is planned to be in use for another thirty years. By then, the newest airframe will be over 80 years old.