Same as lifting the tank- more clearance between filter top and tank bottom. (and airbox top and tank bottom), or at least that's the idea... I wouldn't even guess how effective it is, unless you have the Rene filter in.
How did we get to it? Seems a natural progression, cheap easy mods to get more air in.
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"We are the angry mob,
we read the papers every day
We like what we like, we hate what we hate
But we're oh so easily swayed"
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