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I'm not sure if anyone knows for sure? I mean, even if one is "better" than the other, it can't be by much. The gains would have to be very minimal, I'd think. Seems to me the only way to know would be to dyno your car with one on, then chage out the filters, and dyno it again. I'd rather put that extra money into something else for my car, personally. But maybe someone here knows for sure...?
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