Originally Posted by tvrla
The K&N tends to either not fit correctly or shrinks so it doesn't seal properly, allowing dirty dusty air through. We're talking about the rectangular style on the '81 and newer airheads.
yes, i would think that the k&n i have is the same, standard one used since '81.
i did check mine and it seals alright, as far i can see. should i lose it and use the original bmw air filter? i had a strong feeling that these original carb jetting were designed for the original paper filter.