Originally Posted by logan09

I don't know where you seen a drop in k&n for 160 but they're 69.00 directly from k&n.

Originally Posted by Z-Crazy

Primary function of any air filtering system is to keep dirt out. The fact that filters are dirty, show that they are working well. All filters need cleaning and some need replacement.

Originally Posted by dcains

I don't think you got what I was saying. The grit was downstream (after) the K&N filters, in the plenum and throttle bodies. What do you think that grit dies to piston rings, valve guides, etc?

Originally Posted by dcains

K&N filters suck at filtering. I had one on my M3 and when I had the intake system (plenum and throttle bodies) apart after maybe 5K miles, it was full of grit. I'm in S. Florida, and it's dusty here. Lesson learned. All their other marketing-speak is pure bullsh!t, too, especially the part about straightening the air flow. Never saw a single speck of dust after the first 40K miles with stock paper-type filters.

Nothing wrong with the OEM HR intake. I routinely use NAPA Gold air filters in my '08, and the intake is squeaky-clean at 52K.

Originally Posted by Z-Crazy

Primary function of any air filtering system is to keep dirt out. The fact that filters are dirty, show that they are working well. All filters need cleaning and some need replacement.

Originally Posted by binary_viking

Well after reading all of the posts and doing some research I ended up getting these
http://www.thezstore.com/page/TZS/PROD/11-2968
I sure hope my wife doesnt stumble upon this forum...