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Message: <blockquote data-quote="lincolntc690" data-source="post: 5589779" data-attributes="member: 584398">yes, back pressure, it is increased alot more this way, than with closing and sealing up, i first got interested in the idea when i noticed a difference in how long my dp 15 could take my 2500d, with the 'tarp" pulled over it in my jeep. it seemed like there was more air movement and i could run at a higher volume for a longer time.i started looking into it......</blockquote>

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