I can't really offer any advice unless I know what you wish to accomplish by changing the air filter. For me, I have no desire to change it at all. I have way too much in parts and time in my engine to filter it with anything other than a high quality filter, well sealed in the stock setup. I would say that you should steer clear of K&N filters and other setups that increase initial airflow at the expense of allowing fine abrasives through the element and into the combustion chambers. Someone here posted some really interesting data concerning various filter setups - worth a search, IMHO

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.