High Flow Air Filters

[FloridaJim5]

Thanks guys.  I'm becoming more comfortable with the filter based on the comments in this thread. 

I want this engine to last as long as possible since I'm pretty sure it's my forever Harley. 

[smoserx1]

I put a K&N on my old 99 way back when it had about 80000 miles on it.  Now the bike has 229000.  I did do a top end and made it into a 95 at 179000 and reused the same filter.  Other than the cylinders being worn out from high mileage I saw no obvious signs of damage I would contribute to poor filtration. I know this is not  scientific.  I clean my filter very seldom.  I worked in the air pollution industry my entire career and learned very early that any filter works better with a particulate layer on it. Engineers measure filtration efficiency in microns....that is a millionth of a meter, and 80 microns are roughly the thickness of a human hair.  I cannot imagine sand going through that filter.

[FloridaJim5]

I put a K&N on my old 99 way back when it had about 80000 miles on it.  Now the bike has 229000.  I did do a top end and made it into a 95 at 179000 and reused the same filter.  Other than the cylinders being worn out from high mileage I saw no obvious signs of damage I would contribute to poor filtration. I know this is not  scientific.  I clean my filter very seldom.  I worked in the air pollution industry my entire career and learned very early that any filter works better with a particulate layer on it. Engineers measure filtration efficiency in microns....that is a millionth of a meter, and 80 microns are roughly the thickness of a human hair.  I cannot imagine sand going through that filter.

Thanks for your comment. I appreciate your experience. 

Do you know the micron filtration size of the K&N?  What size in microns is a grain of sand?

[smoserx1]

https://www.engineeringtoolbox.com/particle-sizes-d_934.html

No, I don't know the K&N rating.