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I didn't see much improvement on my grill block but that could be for many reasons. One questions I have is this, is it better to block the upper grill or lower grill? I have a Subaru Outback with the lower grill blocked and the upper grill open. I chose to do the lower one cause it was a bigger opening but it may be at the stagnant point anyhow so the blocking the upper grill may be better for smoothing flow over the hood. any thoughts?
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