You see variations on this theme on a number of different trucks. The black plastic fixture is a gap filler between the top of the bumper and the bottom of the hood on Navistar's ProStar+ models. Air that manages to enter the engine compartment through the gap between the bumper and the hood causes unnecessary drag. Eliminating that source drag is as simple--relatively speaking--as closing the gap.
You see variations on this theme on a number of different trucks. The black plastic fixture is a gap filler between the top of the bumper and the bottom of the hood on Navistar's ProStar+ models. Air that manages to enter the engine compartment through the gap between the bumper and the hood causes unnecessary drag. Eliminating that source drag is as simple--relatively speaking--as closing the gap.
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