Here are two pictures that show the difference between the old and new DLE55's. The main difference it the new cylinder is a pressure injection casting. You can recognise it by the round rod shapes on the rear fins where the aluminum was injected. It is a much cleaner casting. The DLE 30 cylinders were made this way all along. There should be a lot less complaints about casting flaws and voids with the new technology being used to manufacture their cylinders. It was nice that this feature was brought in with no increase in pricing....