I'm gonna have to say that the vehicles that will see the most improvement if there is any would have to be the ones with the larger filters. If you have a lot of air to filter and your using a restrictive air filter, using a less restricting one on a lot of air will see the most results.
It's like someone who just ran 3 miles compared to someone who didn't, and they're both breathing through small straws. The person who just ran 3 miles will need a lot more air than the person just standing and recording time. So if the person who ran 3 miles moves to a much larger straw, they will see much more results than the person who was recording time.
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