mgoodell1976 the K&N increases the amount of air/fuel mixture and creates a bigger explosion in the camber when you have the car floored doesnt really do anything to the idle, but anyways more air=more fuel=more power, just like in a real car. As for the engine temp i've been running mine around 240-260, just make sure you cut a hole in the windshield for airflow over the engine or it will overheat to the 300's.