There are many reasons for why the suction power is weak. It is possible that the hose is blocked by debris. The filter may also be clogged by collected dust or the vacuum box may be full. Clean them in order to clear the blockage.
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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.