What car are we talking about? I'd say for a 15% drag reduction you're going to be looking at more than just little tiny stuff. If you did a front air dam instead of belly pan as well as a grille block that could get you closer. Adding some rear wheel skirts and smooth wheel covers would probably do it.
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He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
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