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My anecdote.
I put 2 K&N filters on my XJS (A V12 has two air filter boxes). It was expensive as the filter area is quite large.
I saw an immediate increase in fuel economy from a steady 12mpg to a steady 13mpg. For an 8% increase in fuel economy it was worth it for me. If it does that for everybody, that's a great environmental measure. I have not measured it on other cars. SUV owners should try anything for that sort of savings.
I also have a K&N open filter in my 88 900T. I like the "nasty HISSSSSSSSSSSSSSSSSSSSSSSSSSS and waste gate TOOOOOOOK" sounds. I like them a lot. Can other people hear them as well as I? (like people on the sidewalk or in other cars with the windows down)
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