Don't know about the bump guard stuff, I'm trying to figure that stuff out myself...
as for your vents and what not: BE DAMN CAREFUL! I broke my center vent while painting so now I have no control over which way it points air. Don't force anything if it feels like its gonna break, cause its plastic and it will. If you do break somethin, buy some jb weld and hope that works. Use several coats of paint in non-humid weather.
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