FWIW I installed a K&N when I first bought the Valk new. The heads have been off twice since that time. At 28k miles and 60k miles. No wear at the cylinder walls, piston heads, valves, stems or anywhere else.
I never installed the prefilter which I had thrown away.
Showing no wear is good. I just bought mine thinking they were bullet proof after always hearing good reports. I know proper routine maintainence is the key to any vehicle.
So having said that, what went wrong with yours at only 28k and 60k? Just curious, I learn a lot just asking questions. That's great you didn't use the prefilter and no signs of wear! I've been debating whether to use mine, There's are a lot of pros and cons. I think it may restrict the airflow somewhat.
Thanks for your input!
