While I have not done any aero mods to the front of my car it is because of the reuced airflow. If your engine runs hot it may not be a good idea to block the air off compleatly. However you might want to take a page out of Mugen's book and do something similar to the 2010 Mugen Insight which dose have the front grill blocked off but has a hole on the left and righ hands side to allow some air into the engine bay to keep it from over heating.
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2 cars one never gets driven the other is an MPG project already at 5% increase in standard driving economy CAI and Pulstar plus. Thinking weight reduction next year.
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