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23 year Ranger veteran
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...... I'm not expecting horsepower gains......
But you do set yourself up for horsepower loss. The reason is simple; cool air contains more oxygen than warm air, as such the cool air will require more fuel in order for the intake charge to achieve combustion stoichiometry (ie, 14.7 parts oxygen, 1 part fuel), the engine management system (key components being the PCM, O2 sensors, the MAF and the IAT sensor) strive to do this nearly all the time and ultimately, the denser the charge of fuel/air, the greater HP that can be developed. When the factory installed cold air intake is removed and replaced with these cutsie aftermarket warm air intakes, this is what can/will happen. Now after reading this it would come as little surprise if the explanation of how things work is ignored and the WAI (Warm Air Intake) is bought and installed, but at least the reason for negative consequences has been spelled out and can be considered before either using the money for smart things, or otherwise.
Edit: if the ^^^^ isn't understood then neither will be the (similar) reason for turbo and superchargers being used to pump up engine output.
Last edited on Wed May 30th, 2018 10:57 pm by CBB9M
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-Bill
04 Ranger FX4 Level II, several mods