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Saw a Youtube about the charcoal filter. On a low horsepower Subaru, just removing it and keeping stock filter gained ~2% hp and lowered 0-60 by almost a tenth. Putting in K&N style with charcoal was barely better than stock without. Best, of course, after market filter no charcoal. Significant hp increase ~ 4 and 1.5 tenth reduction. Don't know it extrapolates to 550 hp cars, but clearly ditching the charcoal makes a lot of sense--even keeping paper oem filters.
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