Sean Roe really knows his sh*t, and he says the S&B's are better. That's enough for me, as I'm sure he is not getting rich off air filters and could sell either brand.
I've got K&N because the car came with them, but I seem to recall a post in the past that the s&b produced 2 more hp in the same car at the same time, may have been done by Sean Roe, and not sure about the statistical significance, would be great to see multiple tests, so I'd like to see lots of people buy new ones of each and do back to back tests with them
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