Your Thoughts on the use of K&N filter?

[sd_boxster]

Good point about the larger-displacement diesel engines... I was, of course, thinking of MY diesel, because I'm a self-centered BMW owner.

To answer the original poster's question (again, since I got carried away due to my self-centered BMW driver ego... heh) - you won't see any perceptible gain from the K&N. While a new properly oiled filter won't foul your MAF, recharging it yourself and doing it wrong often does. Spending additional money that may wind up costing you even more money - for no perceptible change except the addition of a K&N sticker - isn't worth it.

Replacing the soiled OEM filter with a new OEM filter is a good alternative.