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Message: <blockquote data-quote="MultiVAC" data-source="post: 21878" data-attributes="member: 11910">All good that was my first choice when I was researching this. Based on what I was able to find, I didn't think they moved enough air.  I believe the tahoe fans come in 5000-6000 cfm combined.  I think the consensus is my factory fan is around 9-10000.   These measured at 5600, so 11200 for two.  Everyday use I don't think the difference is a big deal, I just don't want any issues at the extreme, like towing.  I found some duramax efan conversion threads that worry about this and sort of drew my own similar conclusionI should be able to start work this weekend and get a thread going with more info.</blockquote>