I'm guessing you're referring to the sparrow upgrade? I bought the red flame one to go on my rare sparrow. It is now a legendary sparrow with a red flames jetting out the back. If you have nothing better to spend your strange coins on that particular week then I would recommend glitzing your ride!
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Yep, I've got the coins. I'm trying to finish off getting crucible rank 3 to buy the rare sparrow I want.