I too did not mean to start a K&N pillow fight
. I only mentioned it as it's the only conversion I personal know of for deleting the air cleaner housing. I do not posses the analytical equipment necessary to study positive and negative affects of the conversion. I personal like running with the stock filter box as per design. I also like the idea of a little bit of that burped up black gold going back through the intake of the turbo which does not happen with the K&N filter kit. I have nothing to support which is better, it's just preference.