I looked at a filtration test/comparison between like 5 or 6 companies' air filters, K&N included, conducted on an R34, and while all averaged 4-5 hp, the levels of filtration varied greatly with HKS being the worst and K&N being second best. K&N only lost to a paper filter though, but HKS was rated as very poor for filtration. This was the usual drop in filter too, made of the same material. This made my decision a lot easier.
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