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Phil, I think by dual K&N filters means installing a air box elimination kit and putting a filter on each carb. My guess is that the K&N is equal to a stock filter, especially if it's just paper.
The K&N is a permanent wire reinforced filter that you clean with a cleaner and then treat with oil (K&N oil preferred according to the K&N instructions, of course). They are supposed to pass air more freely and claim to increase horsepower by some percentage.
The auto sites have major discussions about this with some supporting K&N's claims and others claiming they pass too much dirt along with more air. I have a Daimler Double Six (think 80's Jaguar XJ6 sedan body with a V12 engine) that came to me with K&N filters installed in stock intake cans and a K&N cleaning and recharge kit, so I have the recommended oil for the America's K&N filter which is a single oval filter in the stock air box that I assume is the same dimensions as the stock paper filter. It is perhaps more free flowing than a paper filter but not as free flowing as dual filters directly on each carb inlet, so the jet calculator treats it as a single filter with no affect over the stock filter.
Unfortunately for my headers, the big split in the air box probably overrides any filter choice in affecting the air fuel mix. I taped it up and plan to replace the cracked air box with a used one, but I don't mind the blue headers; I just want the bike to run it's best with the current filter and TORs.
Phil in Northwest Arkansas
04 America, Black, Corbin seat, TORs, no AI, 34K
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