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The "under bus duct" absolutely bombed! I had a sheet metal chase made that was 25" wide and 6" tall at the mouth, I had it flared down right behind the beam as low as I could without tearing it off on manhole lids... it did not produce very much air at all. The single NACAs on each side produced twice as much flow. I may have screwed the aero-namics with the front valance and made it push away most of the air underneath so it was doomed from the start.
NACAs are the way, especially with the hoods Carbon Joe is working on.
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No current VW projects
54 Chevy wagon LS2 AWD
56 Chevy Panel "Lost Cause"
VKG Bastage child
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