warm intake
Many good comments already.Here's my two cents.The majority of auto emissions occur within the first few minutes of a "cold-start." The warm-air intake attempts to aid fuel vaporization during this warm-up period,reducing hydrocarbon emissions ( VOCs and CO ).Once up to operating temp,a temperature-controlled bypass-valve modulates intake charge temp to balance between charge-density ( horsepower ) and complete combustion ( emmissions ).GM/SAAB places an electrically-heated plate ahead of each intake port of the cylinder head to accomplish this cold-start emissions abatement.
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