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Looks like those decals do not follow the curve of the C4s windshield. The middle is closer to the top than the ends.
If you'd like to get a decal made exactly like you want (color, font style, curved/straight, etc) check out this site. http://www.decalcenter.com They are reasonably priced and give great service including their installation instructions
I know everyone has their own tastes, and no offense, but that thing is kinda tacky. If you really need to darken the top. Just do a little tint up there!