I have dual IDF40s with the oval K&N air filters. i don't know how effective these really are. It seems my oil gets dirty rather quickly.
Searching through the racks at my FLAPS has been futile.
is there a paper air filter alternative to the K&N filter that will fit the weber housings?
Yup
Piercemanifolds.com
Ae they real K&N or the cheap china copies?
You could get a set of outerwares, they help.
https://www.cbperformance.com/product-p/3565.htm
Once they've dirtied up some they actually begin to filter better.
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