My truck continues to run happily but curiosity got to me and I decided to do a little test to determine how well the Vararam Air Grabber seals with the hood liner above. So, I hand brushed some ArmorAll on the top surface of the rounded, rubber "crush" seal that surrounds the air filter (see pics above) and closed the hood to see how much, if any, ArmorAll transferred to the hood liner. I reopened the hood, and to my delight, a perfect pattern of the rubber seal had impressed itself onto the hood liner. That's good proof that, except for the obvious front air intake opening, it seals ideally. In my mind, the test confirms it truly is an effective cold/ram air intake. I don't regret a penny I spent on the Air Grabber.