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Old 01-09-2009, 08:18 AM   #2 (permalink)
Daox
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I think anywhere from 20 to 40 sq inches of opening would be good. But, it all depends on how you drive (city/highway/pulse and glide/DWL/etc.) Its possible you could need more.
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Last edited by Daox; 01-09-2009 at 09:03 AM..
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