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      11-17-2008, 10:06 PM   #1
italiantank26
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Air filter

Just wanted to let those people out there who have the 128i know, if you are looking for a easy cheap, and quick performance upgrade, I definetly recomend putting in a k&n filter. I just put mine in two days ago. It is only 47$. You don't feel a big difference, but you definetly do feel a difference, car is a little more responsive, and the gas milage is better.
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      11-22-2008, 01:58 PM   #2
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I wonder if the air filter for the '08s will fit the '09s... my instinct says yes, but not 100% sure. Any idea?
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      11-24-2008, 09:34 PM   #3
italiantank26
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I'm guess the same thing, I purchased mine online, so if the air filter does not fit for the 09, then they probably won't sell it to you.
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      11-25-2008, 03:50 PM   #4
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The K&N part number is E-2022. I've just put one in my 125i, so am looking forward to seeing better fuel economy.
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      11-25-2008, 07:27 PM   #5
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hey corey, did you ever get your fuel consumption down???
i cant say mine is flash considering the amount of highway driving im doing...
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      11-26-2008, 06:38 PM   #6
Blacky
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Hey Jksgoh what do you call not flash?
I get an average of 8.7 out of my 130 with lots of highway driving.
I think that is pretty good considering
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      11-26-2008, 08:14 PM   #7
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well i've recently reset it and im getting about 9.8 now... but thats going up to ballarat and down to melb... so i guess the going up hill bit to ballarat is prob putting my average up a little...
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      11-26-2008, 10:51 PM   #8
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Mine has not been reset for more than a year and when I say highway I mean the eastern and alike around Melbourne, a few trips to Philip Island and up north to the border.
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      11-26-2008, 11:05 PM   #9
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hmm.... i would have thought that with the driving i do, it would be lower than yours.... duno... strange that the 130 is getting a lower average.... has it always been around that level since you got it, or has it slowly come down?
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      11-27-2008, 12:56 AM   #10
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Quote:
Originally Posted by jksgoh View Post
hey corey, did you ever get your fuel consumption down???
i cant say mine is flash considering the amount of highway driving im doing...
I averaged around 7 on my recent trip up to Coffs and back, average speed was 99.6 :wink:

Now that I'm back in Melbourne, I'm still getting 14L/100km on my day to day driving

I only fitted the K&N filter a few days ago, so I'm yet to see what affect it has, if any. I'd be surprised if it makes any difference at all. I certainly can't noticed any gains in performance - might have been a complete waste of money.
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      11-27-2008, 07:40 AM   #11
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Does anyone know if replacing the OEM filter with a K&N will affect the warranty?
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      11-27-2008, 03:37 PM   #12
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Is this a panel filter or a conical style?

that average consumption has been there for a while now, TBH sometime I think it is stuck.
Maybe I should reset and see what I get going forward.
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      11-28-2008, 12:17 AM   #13
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Quote:
Originally Posted by Blacky View Post
Is this a panel filter or a conical style?

that average consumption has been there for a while now, TBH sometime I think it is stuck.
Maybe I should reset and see what I get going forward.
Conical:

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      11-28-2008, 01:16 AM   #14
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I love my K&N filter, i have taken the top of the box so itīs like a open filter and it sounds soo good and goes so better.
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      11-28-2008, 07:08 PM   #15
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Quote:
Originally Posted by Eddie_125i View Post
I love my K&N filter, i have taken the top of the box so itīs like a open filter and it sounds soo good and goes so better.
You're not worried about debris getting down in there?
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      11-28-2008, 10:54 PM   #16
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Debris, isn't that why you have a filter!!!
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      12-01-2008, 08:51 PM   #17
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I can confirm that the K&N filter does sweet fuck all in the 125i. It adds no performance, nor does it have any impact on fuel economy. Total waste of money in my opinion.
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      12-03-2008, 02:19 AM   #18
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Any gains in the air filter will only happen at high air volumes (though it can help reduce sucking losses at lower volumes, whilst technically adding to pumping loses as well), and the gains will be so small you wouldn't 'feel' them.

It will however save you having to replace the filter at service, provided you inform BMW not to swap.
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      12-06-2008, 08:54 AM   #19
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Quote:
Originally Posted by Blacky View Post
Debris, isn't that why you have a filter!!!
Well with the top off of the air filter box itself, you're bound to at least get moisture or whatever on top of that filter. Plus, the intake channel leading from the grill to the air filter isn't being utilized.
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      12-06-2008, 11:47 AM   #20
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i think the majority fo cold air and short ram intakes are open filters, i don't think having the filter exposed is going to be a big deal.

i've had them on previous cars and put 50,000 miles on an open filter before
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