I was considering buying a k&n air fikter for my 07 expy. Is it worth it? Or should i just keep buying the paper filters?

 

personally, I would buy the paper and just routinely replace them. The K&N requires continual cleaning and oiling and if you forget or don't oil it enough, the mesh is large enough to allow dirt in. Just my .02 I used to run them, but then I got honest with myself about how often I would clean it and oil it and got rid of it. I don't recommend them to anyone anymore. Not my diesel buddies and not my antique auto friends.

 

And if you oil them too much you screw up the MAF sensor.

 

Paper... K&N gets you no additional benefits.

 

Find this site on line about Paper and K&N filters, nice read. You may want to read this first before you buy.
K&N Air Filter Review - Debunking the Myths (and why OEM is better)