Normally, no, as they come with a hook that provides an anchoring ability so you can make accurate lines without further help. However, sometimes you may not have where to anchor the hook, so a second person is the great idea to make it work.
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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.