I might be trying a few simple aeromods on my neighbor's 2002 Sentra. This car has a large lower grill and a smaller upper grill. Totally blocking the upper grill is a no-brainer, but I'm not sure what the best approach for the lower grill is. This car has a large gap between the grill and radiator. And the gap is open on the bottom. So I'm sure a lot of air going through the grills just ends up under the car. It's like Nissan wasn't even trying. So should I close off the area with a short belly pan and block part of the lower grill? Or block all of the lower grill and use an air dam to get airflow into the radiator from under the bumper?
