I had a shop install fiber fill on my last 2 setups... which were ported. big box with 4 10" earthquakes.... oldschool.... and the setup in my silverado.... it didn't shoot anywhere. Majority of the good shops will install fiberfill. In a ported box it will absorb standing waves and remove some of the muddy sound heard in many ported systems.. I dont know what the hell you guys are takling abuot shooting fiber fill all over the trunk.... dont know wtf you are using.