I made one out of a manilla file folder. I had the hypercrapper off and on due to rubber grommets failing when I bought it. There are 2 on mine due to spacer required.

 

I've never had a problem with K&N...

 

your dealer is right if it will make you feel better run it , or if you can see light between the backing plate & carb run it , flash light from bottom up will let you know , as for K&N one on my bike & one on my truck with 295 + K miles on it (01 Dodge diesel ) clean it ever so often & good to go

 

from years of playing in the dirt there's no filter better at filtering out dirt than a foam filter. yes the K&N filter flows a little bit better when clean but as it gets dirty it starts to lose cfm. the foam will flow the same dirty or clean
an still trap 60% more dirt than a K&N we stopped selling the K&N because they just don't filter very well.

 

This gasket you're questioning runs a little over one George Washington...If you're that frugle, make one from old cereal box.

 

yes for the dirt the foam is best hands down , but if you keep the K&N clean they work just great on the street ,I clean mine every few months or as needed no problem yet & I've run them for many years each to there own I guess

 

your right if there's no real bad dirt in the air your fine. but I live way out in the middle of BFE gravel and dirt roads and lots of corn and cows.

 

I just clean mine when it looks like it needs it.

 

in the middle of BFE gravel and dirt roads and lots of corn and cows.
they paved our roads a few years ago , but still out in the middle of close to no where ,My Horse where hit two years ago with my sons on them & guy next door to say has his horses & cattle still
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Frugal? I didn't ask how much they were...... I asked if they were necessary.