You shouldn’t let the foam to dry since depending on the paint job on the car; it can leave stains. There are some cases in which the foam will dry up completely and can be easily removed with a dry cloth.
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According to Kenneth Taylor, the 3 best cold air intakes for your chevy Silverado are the K&N Cold Air Intake Kit 77-3082KP, the K&N Cold Air Intake Kit 63-3082 and the K&N Cold Air Intake Kit 57-3058.