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Message: <blockquote data-quote="dyabolical" data-source="post: 2006469" data-attributes="member: 569410">Blowthroughs, bed boxs, extended boxs...different names, all same concept.The reason i don't like them is because it defeats the purpose of the truck....it is a truck for the bed.  You are cutting a hole through the rear of the cab and connecting it to the bed by way of a long box....I have just seen some bad things happen to those.  I know a guy who had one built...$2000 dollar job...he takes it down the road and hits a pothole and tears the box to pieces because his bed torqued.Most are smart enough to use an accordian type boot that flexes with the chassis, but these can lend to really bad road noise, no matter how much dynamat you use.Others build the entire box in the bed, and then use a flexible tube to connect to the cab...this works okay, but the spl and sq are somewhat lacking.</blockquote>

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