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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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The idea has always struck me as gimmicky. ...somehow a blob of grit is supposed to magically make a better pathway than what the engineers (and their testing & computational fluid dynamics) came up with.
That is, simply opening up the tube might sound smart (for some) but really, there is more involved with efficient intake than just a high flow number.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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