I used to run K&N on everything. I can now say that you're not gaining much with K&N, in fact you're giving up quality filtration. Ever hold a K&N up to the light? See all the small pin holds that dirt can pass through? Now notice all the fine dust on the filtered side of your filter housing; not good.

Still don't believe me? Take a look at the Arlen Spicer ISO 5011 Air Filter Comparison - link

So you'll be better off with a good paper filter. By the way, Champion Laboratories, Inc. makes the air and oil filters for AC Delco. They also make the same filters under the STP brand you can buy for less at Auto Zone.

Or another option if you want an even better filtering/flowing air filter over paper, take a look at Dry cell synthetic nanofiber EaAR Racing Air Filters

Hint: Nanofiber synthetic air filter media is what the U.S. Military selected for the M1 Abrams Tank program.