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These lip spoilers greatly depend on the vehicle they are attached to.
However they all try to serve a similar purpose in promoting clean separation. At the rear, you want the smallest radius at the trailing edge. For many reasons, the vehicle body often does not have this ideal radius, so a spoiler may be beneficial.
Will this make a huge difference? No. But if you're like me and take it one count of drag at a time, things like this will add up.
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