Well, in an attempt to locate an air filter for my 09 toyota corolla, I have checked Auto zone. Advanced auto. Murray's. Napa. Walmart and meijers. None have any filters in stock for my car. The toyota dealer wants 25 dollars for a oem filter. My question is, for the money, should I just pay another 25 bucks and get a k&n filter? I know there has been discussions as to k&n allowing more dirt into the engine. I just want your guys opinion on this before I buy the filter. Thanks