If you pay for the season pass, you get a 15% increase in base score. If you're at 550 power and max everything out, you get 2.6 million base score instead of 2.2 million. This is my situation, like that of many other players, it doesn't seem very correct to me.
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They already made it easy enough for anyone to get max score on the salt mines. The helmet and emblem aren't any different than any of the other items in the season pass track at this point.