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How many of you have disconnected the Pre heater hose 200

quote: "In the far north preheated air is a good idea, if only to maintain fuel economy, and for those that care, emission standards"

Just curious, does anyone know why most modern FI cars use preheaded intake air? Is it just for the emissions during warmup? How would cold air intake influence fuel economy and emissions once the engine is warmed up? I always thought cold=dense=more performance.






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