Nitro -- I would probably recommend two engy's of equal level.
Two engy's are nice for speed factors, but when they are imbalanced (one much lower than the other) the second engy can actually slow your sub down. This is due to how the speed bonus is applied. When there are 2 engy's, the first one is only factored at 70%.
As you go up in ss class, you will be able to use the engy's with other support sailors.
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