gullywasher
Husqvarna
AA Class
That's pretty much all subjective. Got any of the screen captures or pics of the throttle inside?
For me, as a rule, if I look at a car or bike to purchase and see a KN filter on it I generally walk away.
When I did the Pod mod video, that bike had 8k and a KN filter. The airbox and throttle body were packed with dirt. When he moved, he offered the bike to me for $3.5k, which is a good price for a Terra, but because of the dirt in the engine, there is no way I wanted that bike for anything more scrap prices.
I tried a K&N filter on one of my motorcycles once just because it was the same price as the OEM paper filter element. When I swapped out the OEM filter for the K&N, everything was clean as a whistle, and that is with about 14K street miles and several light off-pavement trips behind it (500lb bike, nothing too dirty going on.)
I checked the K&N 3K miles later since I had just done some light off-roading for the first time since installing the K&N and was worried it might be gunked up. The filter itself looked pretty clean, but there was a film (albeit quite thin) of very fine grime along the throat of the throttle body and the airbox. Now, I am no filtration expert, so it is quite possible that this very small infiltration of fine particles isn't material enough to cause any premature wear to the engine over the life of the bike so long as basic maintenance is kept up. I don't know. I just know it was spotless when the paper filter was in place for almost 5 times the mileage. Back to OEM.
You're experience may vary of course, and I know guys that swear by K&N. Just sharing my experience for reference.