I'm not here to bring a negative light to the subject but given the airflow "tech" that's being discussed.....which is all good, we are driving street cars here.
IMO a few horsepower lost over the type of air filter used is really not that significant.
16 years ago when I first developed the WFO, I did track testing with open element housing and the WFO shaker setup, swapping out with a standard paper and a cotton gauze filters. The performance between the two was virtually the same.
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