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Old 05-30-2014, 09:07 PM   #2 (permalink)
Vman455
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Pope Pious the Prius - '13 Toyota Prius Two
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The 4 "boat tails" are fins, the same as on the 3rd gen Prius. In that application, Toyota claimed in their press release that they help directional stability. You're probably fine without them.
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