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I had one on my truck inside the grill. The way I had it mounted, it would flex and allow air to flow past it and wasn't very effective. I noticed an improvement by moving to the front of my grill.
I think if you mount behind the grill, you need to make sure it will still prevent air from flowing around the block once the vehicle is moving.
Mounting in front of the grill makes this easy, since air pressure will keep the block in place.
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