I dunno if it's the lid or my K&N, but I always have crap on my MAF screen, is there some kind of foam ring I can put around the perimeter of the lid so I don't get the crap like grass and small pebbles?
Your K&N panel filter should have come (at least they used to) with a foam gasket that gets applied to your air lid. If it didn't then you can either call K&N and request a new one or get some weatherstripping foam from Home Depot and attach it around the inner periphery of your lid so that it seals against the filter.
when i bought my car it didnt have this little piece that holds in the air filter properly. I went to the dealer and got the piece and have had no problem ever since. Without the piece you can clearly tell the air filter doesnt fit properly.
I have the K&N filter and TSP lid w/o the foam liner. I saw that there was a huge gap between the filter and lid so used a bead of RTV on thr filter and let it dry before installing the lid back on, problem solved.