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Message: <blockquote data-quote="smgreen20" data-source="post: 6178908" data-attributes="member: 560505"><p>I've done 7 different boxes in my Y2K GMC Sierra  ext cab Z71 and it didn't make a bit of difference if it was flush or not, though I did have the rear of the box open so it was vented in that manner on the one down firing box I built. I hated the down firing box. Shook the hell out of the truck for no gain in output.</p></blockquote><p></p>

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