Intake & Exhaust Questions and info regarding various aftermatket exhaust systems for the G35 (Headers,Y-Pipes, and Cat-Back Systems)

Clean your K&N air filters regularly!!!!

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Old Jun 14, 2007 | 02:23 PM
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Exclamation Clean your K&N air filters regularly!!!!

I cleaned my air filter last night and on the way to work this morning i noticed quite a bit of difference in acceleration and overall reaction time of the engine.

Of course, when i took my filter out of the car yesterday I banged it on the ground a few times and was actually able to make a small pile out of the dirt that came off it. I've never seen my air filter that dirty, must be all the dust and crap in the air here in Phoenix. I'll be cleaning it every 6 months from now on. Hopefully my gas milage will improve too.

Just reminding you guys that these filters work great, only when they're clean!!!

now, time to dance...DOMO
 
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Old Jun 14, 2007 | 04:21 PM
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I thought they actually filtered better when dirty? Not like stuck debris dirty but normal dirty.
 
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Old Jun 14, 2007 | 06:31 PM
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Originally Posted by willthethrill
I thought they actually filtered better when dirty? Not like stuck debris dirty but normal dirty.
they might filter better, but any dirt on the filter is going to restrict air flow.

in my case i was just restricting air flow and killing my engine.
 
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Old Jun 14, 2007 | 07:27 PM
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The air filter gets switched out and cleaned every 2500 to 3000 miles.
 
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Old Jun 15, 2007 | 12:47 PM
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Originally Posted by willthethrill
I thought they actually filtered better when dirty? Not like stuck debris dirty but normal dirty.
Yes, they do filter better as they get dirtier...but they will flow less too, marginally less, but less nonetheless.
 
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Old Jun 15, 2007 | 02:49 PM
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Has anyone tried Green or any of the other filters? I've been told that K&N comes in last for filteration, and isn't top for airflow anymore, either.
 
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Old Jun 17, 2007 | 12:28 PM
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Originally Posted by ISMSOLUTIONS
Yes, they do filter better as they get dirtier...but they will flow less too, marginally less, but less nonetheless.
true, it isnt the best when the airflow is less, less, less. i really liked that did you try to say less that many times. rofl i seriously was laughing hard.
 
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Old Jun 18, 2007 | 09:46 PM
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Originally Posted by oooooooooooooq
true, it isnt the best when the airflow is less, less, less. i really liked that did you try to say less that many times. rofl i seriously was laughing hard.
haha, i didn't even notice that.
glad i got my point across
 
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Old Jun 25, 2007 | 11:27 PM
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I may be wrong but a properly designed filter should filter great from a new condition.

The purpose of an aftermarket filter is to maintain superior flow even as the filter loads up with debris.

The OEM filter will have restriction levels increase exponentially as they load up but a well designed oiled cotton filter will have restriction levels increase only linearly while maintaining a superior filtering efficiency equivalent to OEM paper elements.

The fact that they claim it filters better as it gets dirty is rediculous as that implies it is not filtering so well when new.

Well, guess why? Because its easy to make a filter that either flows well or one that protects well, but to get one that does both well takes some effort.

And the original poster's observation is evidence of that...
 

Last edited by Battlewagon; Jun 25, 2007 at 11:34 PM.
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Old Jun 25, 2007 | 11:34 PM
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someone told me the same...the filter is better when its dirty...and im like wtf you serious.... but what ever i rather have a clean looking filter than a dirty one
 
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Old Jun 25, 2007 | 11:46 PM
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Originally Posted by G35Pinoy
someone told me the same...the filter is better when its dirty...and im like wtf you serious.... but what ever i rather have a clean looking filter than a dirty one
true, because the longer you keep dirt in there, the more opportunity for it to find the leaks in those filter seals.

The filter should make a nice tight fit with the air box at ambient temps and really seal up as the engine bay gets hot.
 
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Old Jun 26, 2007 | 12:03 AM
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You gotta be kidding............?

Where do you guys get your ideas from? A dirty filter doesn't flow more air,
that's one of the reasons we keep them clean. I'm using Stillens CAI which
contains a large K&N filter. I clean this filter every 3K miles and it's never
really dirty at that mileage......but I clean it anyway......more airflow!
 
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Old Jun 26, 2007 | 12:05 AM
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Originally Posted by oooooooooooooq
i really liked that did you try to say less that many times. rofl i seriously was laughing hard.
At first no..I just wrote it..then when I re-read it, I was laughing too..I just had to leave it as it was..get it?

Rick
 
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Old Jun 26, 2007 | 12:09 AM
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I don't think anyone actually said a dirty filter flows better - what was said is that a dirty filter, or somewhat dirty filter, FILTERS better, though a dirty filter will not flow as well, duh.

The context was that smaller particles will get trapped better, when larger particle are in the way. Technically, the air is more filtered and cleaner, when the filter is a little dirty.

Rick
 
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Old Jun 26, 2007 | 12:10 AM
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Originally Posted by gary c
Where do you guys get your ideas from? A dirty filter doesn't flow more air,
that's one of the reasons we keep them clean. I'm using Stillens CAI which
contains a large K&N filter. I clean this filter every 3K miles and it's never
really dirty at that mileage......but I clean it anyway......more airflow!
i don't think they are saying that a dirty filter flows air better. rather, they are saying that a dirty filter will filter the air better.

it may have less air flow, marginally less (like rick said), but the less air that gets through...the less dirt that gets through as well - theoretically speaking of course.

edit: rick, you beat me to it!
 

Last edited by Calvin; Jun 26, 2007 at 12:14 AM.
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