I think these pod bumps could possibly work, but I don't see how one could actually get bonafide gains without precise placement on the vehicle. The information I've read about vortex generators and microvanes talks about how they have to be properly placed/positioned, or they'll harm airflow instead of improving it. This is the reason I've not tried any VGs or such stuff; I don't want to do hundreds of miles of tuft testing to see if I got it right or not, when there are several proven items I can install and benefit from...
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