Air lids
lids are worth 10rwhp + or - a few pending engine and other mods!
They work because the stock air backs is constructing with ribs/baffles on the inside that cause turbulence and restriction in the air flow. the worse part of the design is the giant silencer box that is attached to the stock lid. It hurts airflow/pressure and makes its a pain to get to anything under the hood!
Engines are internal combustion vacuum pumps, the more air in and the more air out, the more hp.
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