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I can't say that this was a "big" success, but when spraying the water down the side of the van, I could see a difference in the flow stream of water.. the video we shot did not pick up much and when we slow the video down. I can see these vortex working to some degree. We're not disappointed, and we went ahead to placed all of the wing worms on the van were we needed them. The roof top shot, reminds me of those "things" tuners are using on their cars placed right before the rear window. maybe these things will work for others, but our van is designed too much like a brick for these things to actually work like they should.
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