Is it possible that a brand new clean stock air filter is just as good as a brand new K&N? I have a 2004 3.01 Z4 with a brand new stock air filter from the dealer. But I bought a K&N performance filter because it has the word "Performance", right in the title. I guess I expected more "Performance" with it. I know its just the stock intake, but the z4 doesnt have a bad stock intake setup so I figured a K&N filter would improve on the design. But it doesnt seem any different to me. Is it just my imagination?
K&N Filter, Is it just me?
- Thread starter Z4WAM
- Start date
I also use a high flow airfilter. I also have a steptronic trans. What I notice with the high flow airfilter is that when down shifting, I am able to get second or third more often when I want it that with the OEM filter because of the OBC nanny. With the OEM filter, when I go into a corner, I can not always get the gear I want. Those without the steptronic, I doubt you would see much of a difference. I do seem to get 2-3 more miles per gallon witkout the OEM filter. I use an OEM filter when I clean and re oil the filter I use and notice a difference when I forget and leave the OEM in. :roll: 
if u really want to know, do a test ... with the 2 filters out of the car, take a vacuum put it against the the filter so the air moves in the same direction that it would if you were driving, see if you can feel a difference in air flow?
or u can do the opposite if you have a machine that blows vs sucks, you can see if u feel a difference or have a ball on the other side of the filter to see if it rolls away faster
in the end, the real world difference in power will be minimal at best, but i find w/ the K&N filters, you get to hear the engine more when u step on it
or u can do the opposite if you have a machine that blows vs sucks, you can see if u feel a difference or have a ball on the other side of the filter to see if it rolls away faster
in the end, the real world difference in power will be minimal at best, but i find w/ the K&N filters, you get to hear the engine more when u step on it
I put a K&N in that someone let me have for cheap. Cleaned it oiled it and can't feel a jot of difference from OEM. Waste of time and money IMHO to go out buying these.
If you mess about testing either as sugested above with vacuum's or air pressure, then bin them both aftewards. As GP20 says's they'll be ruined :thumbsdown:
If you mess about testing either as sugested above with vacuum's or air pressure, then bin them both aftewards. As GP20 says's they'll be ruined :thumbsdown:
