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<blockquote data-quote="Buck" data-source="post: 8772777" data-attributes="member: 591582">I sealed my sunroof off with loctite pl premium.&nbsp; So, I had .5&quot; MDF glued to the entire front half of my roof in a double layer of 1&quot; all around the sunroof, and the back had about 2.5 layers of deadner on the entire roof.&nbsp; That gained me about 2-3 db alone, adding the wood and sealing off my sunroof, and that was just with 2x 1400w rms 18&#039;s on a rated 1200w RMS.&nbsp; My sunroof would open about 1.5-2&quot; on the lows 30&#039;s and below.&nbsp; The problem is that my hatch started ripping sheet metal after that, and I was going to have to like ratchet strap my rear doors closed.&nbsp; They were clapping so hard it was pushing right through the weatherstripping gaskets and hitting metal on metal.&nbsp; It was extremely annoying to hear, too.&nbsp; I braced my hatch with round wooden dowels and filled it all with high density foam, and it made it even louder, but made everything break more around the hatch half-glass.&nbsp; Ugh, man, I was literally ripping that Explorer apart.My point is:&nbsp; whenever you stiffen one part of your vehicle, that pressure is going to try to escape out of another part of the vehicle.&nbsp; You really want to calculate what part of the vehicle you want to flex most that has the least likely chance of breaking.</blockquote>

[QUOTE="Buck, post: 8772777, member: 591582"] I sealed my sunroof off with loctite pl premium. So, I had .5" MDF glued to the entire front half of my roof in a double layer of 1" all around the sunroof, and the back had about 2.5 layers of deadner on the entire roof. That gained me about 2-3 db alone, adding the wood and sealing off my sunroof, and that was just with 2x 1400w rms 18's on a rated 1200w RMS. My sunroof would open about 1.5-2" on the lows 30's and below. The problem is that my hatch started ripping sheet metal after that, and I was going to have to like ratchet strap my rear doors closed. They were clapping so hard it was pushing right through the weatherstripping gaskets and hitting metal on metal. It was extremely annoying to hear, too. I braced my hatch with round wooden dowels and filled it all with high density foam, and it made it even louder, but made everything break more around the hatch half-glass. Ugh, man, I was literally ripping that Explorer apart. My point is: whenever you stiffen one part of your vehicle, that pressure is going to try to escape out of another part of the vehicle. You really want to calculate what part of the vehicle you want to flex most that has the least likely chance of breaking. [/QUOTE]

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