Do a little searching and you will find that there are actual numbers on filtration. Whichever one you get makes little difference. I've seen nothing from an independent user who dynoed showing gains when it was done on a dyno that didn't belong to the people who sold it or the people who made it no matter what year. Unlike the older cars with the liner the newer ones don't get much of a savory sound improvement either. I could barely tell the difference between stock and the AA green filter.
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