Originally Posted by Modshack

That's not really true....My experience (having sold 1000+ K&N based systems for Audi/VW cars), is to clean them about every 15-20K. Follow K&N's cleaning instructions and they'll come back just like new and last forever. You don't need to change them unless you damage them. Throwing away Re-useable filters is both wasteful, stupid and bad for the environment to say nothing of what it does to your wallet. I've brought K&N's back from the dead to look and perform like new..