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Do:
-upper grill block- I have been running this way for many years, no issues,
then do:
-a front belly pan of coroplast from the 'chin' of the front bumper/lower grill to the radiator support so the air that comes in from the lower grill is forced through the radiator and not bouncing off of it creating a lot of turbulence in the front of the car in front of the front wheels.
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2013 Honda Civic Si - 2.4L
OEM front to back belly pan from the factory.
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