K&N Filter - How Does it Compare?
K&N's are crap......Ok, that may be a bit harsh, but they aren't a good air filter. I would like to see all of the air filter manufacturers publish their ISO 5011 test results so that we could compare on an equal basis, what they are selling us. I am pretty sure that the K&N folks won't, because there filter really doesn do that well in the real world of quanatitive testing. There is so much misinformation out there, and a lot of PR and hype, that you have to figure that somebody is making a lot of money on this stuff. All I am seeing is 99% efficienty, yada, yada, yada......
Ok, all you K&N fans, before you start flaming, go here and read this entire technical report:
http://www.duramax-diesel.com/spicer/index.htm
What you will see is that most filters, even the K&N's will keep 99% of the dirt out of the engine, so the K&N claims are true. Problem is, a good paper flter will keep out 99.9% of the dirt (or put it another way, the K&N is passing 10 times the amount of dirt when compared to the paper filter) and while the flow restriction is indeed higher with a paper filter, it also had the capability to trap a lot more dirt than a K&N. What that means is that a K&N will give you some power while it is clean, but the trade off is passing more crap thru your enigine over time, and when it gets dirty it is pretty much worthless. Also the total amount of dirt the K&N can hold is a lot lower than a good paper filter. So if you want to use your K&N you should clean it often, since it will only go about half as long as a proper paper element. While lots of folks are saying they got this many thousand miles on their K&N's there are vey few that have used them for the kind of life where you will see a difference between a conventional filter and a K&N...
I plan on keeping my car for a long time, so I am keeping a good quality paper element in it, and changing it a reasonable intervals. If I give up a couple of horsepower doing that, compared to using a poor filter, that's fine. If I want more performance, there are ways to get it without passing more junk thru you engine and potentially reducing the life of the rings and valves....
The Best of Corvette for Corvette Enthusiasts
Funny though how Green writes up to clean and reoil thier filters at 50K miles, but in the clean and reoil kit, they say to do it every 6k miles.


I clean the filter and do stuff every thanksgiving 4 day holiday, so I have a reference date stuck in my feeble brain.
My '01 coupe still has the factory paper, I am going to change, and now theres so many filters out there, it's hard to know whats best.
I would guess that a few of the other manufacturers have bought a K&N, and done their own testing, and either are the same or might be slightly better. but without independent testing, who really knows for sure
K&N's are crap......Ok, that may be a bit harsh, but they aren't a good air filter. I would like to see all of the air filter manufacturers publish their ISO 5011 test results so that we could compare on an equal basis, what they are selling us. I am pretty sure that the K&N folks won't, because there filter really doesn do that well in the real world of quanatitive testing. There is so much misinformation out there, and a lot of PR and hype, that you have to figure that somebody is making a lot of money on this stuff. All I am seeing is 99% efficienty, yada, yada, yada......
Ok, all you K&N fans, before you start flaming, go here and read this entire technical report:
http://www.duramax-diesel.com/spicer/index.htm
What you will see is that most filters, even the K&N's will keep 99% of the dirt out of the engine, so the K&N claims are true. Problem is, a good paper flter will keep out 99.9% of the dirt (or put it another way, the K&N is passing 10 times the amount of dirt when compared to the paper filter) and while the flow restriction is indeed higher with a paper filter, it also had the capability to trap a lot more dirt than a K&N. What that means is that a K&N will give you some power while it is clean, but the trade off is passing more crap thru your enigine over time, and when it gets dirty it is pretty much worthless. Also the total amount of dirt the K&N can hold is a lot lower than a good paper filter. So if you want to use your K&N you should clean it often, since it will only go about half as long as a proper paper element. While lots of folks are saying they got this many thousand miles on their K&N's there are vey few that have used them for the kind of life where you will see a difference between a conventional filter and a K&N...
I plan on keeping my car for a long time, so I am keeping a good quality paper element in it, and changing it a reasonable intervals. If I give up a couple of horsepower doing that, compared to using a poor filter, that's fine. If I want more performance, there are ways to get it without passing more junk thru you engine and potentially reducing the life of the rings and valves....
a
paper filter will clog much quicker, and hold less dirt and the poor performance gets worse. I have clean oil a 3.5k, I never go further than that. There is no good intake that does have a K&N type filter.
Use your paper filter and read your "reports" who cares. And drive your slug. but lay off the K&N type as they are
the best performance filter for every day use, hell even the back of my Throttle blade was white glove clean a 17k..shezz
Last edited by nuke61; Sep 15, 2006 at 02:20 AM.











Really felt a difference over the stocker! Much more crisp in the response!
Thanks,Matt
I'd be willing to bet that in most cases the increase in power is neglegible... However, since 99% of the people who buy a performance filter never put their car on a dyno they have no idea if they are really makinng any more power.
I saw a K&N add on TV the other night and the guys who had one in their truck were saying "you can hear the difference, it's making more power it goes wwaaaaaaa". What is is making is just more induction noise because there is no cover on the airbox, but if it's louder, it "feels stronger".....
To coin the old phrase, "there's a sucker born every minute"
I'd be willing to bet that in most cases the increase in power is neglegible... However, since 99% of the people who buy a performance filter never put their car on a dyno they have no idea if they are really makinng any more power.
I saw a K&N add on TV the other night and the guys who had one in their truck were saying "you can hear the difference, it's making more power it goes wwaaaaaaa". What is is making is just more induction noise because there is no cover on the airbox, but if it's louder, it "feels stronger".....
To coin the old phrase, "there's a sucker born every minute"
Same thing as the $40 audio cables vs. the $5 ones.












