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That is a tricky question because of the many variables involved in the physics of the system â€“ base horsepower, altitude, ambient air temp, humidity, intake system, MASS airflow sensor and intercooler efficiency can all affect the performance of the system. DEI tested a naturally aspirated Honda Civic with 110base HP on an 85Â°F day with 72% humidity using just one Air Intake Chamber and found a 9% increase in horsepower. In this example they saw an intake temperature of 38Â°F and that is just with an Air Intake Chamber. Other tests have produced horsepower increases in excess of 40 degrees plus from heat soaked conditions utilizing our cryogenic components. What racer couldnâ€™t use an extra 40 horsepower? Think about how your truck performs on a nice cool fall morningâ€¦it feels more responsive and powerful. As the engine heats up it loses horsepower and becomes a little sluggishâ€¦What DEI has created is a way to give you that cool fall morning on demand and eliminate power robbing heat soak!!