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I know everybody here really likes coroplast. But I've got some spare 1/4 (along with 3/8, 1/2, & 3/4) ply in the tool shed. So it's got the edge.
And it's a BIG no on grille block. I spent 10 grand and 3 months (don't ask!) getting this trucks motor replace a year ago. Water pump went bad and heat destroyed the motor. The 4.7 doesn't like heat. So anything that maybe possibly could someday interfere with cooling is out.
The reasons for using a factory air dam: 1) ease of install, no engineering required. 2) will look like a factory job, air splitter will be hidden.
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