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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 12-25-2010, 09:30 AM   #1
DBrown
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What is the best air filter ?

I need a new air filter, but I don't like the stock one. I like the idea of a k & n filter that I can clean an reuse. I searched a few forums and I didn't find much on k & n filters. If anyone is using k & n filters, what do you think of them? Is there a better aftermarket filter that I can easily gets hold of?

In my truck I used a k & n filter, but the oil from it caused my mass air sensor to malfunction and I had to replace it and ditch the k & n filter. Has anyone seen these problems in the BMW
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Old 12-25-2010, 09:39 AM   #2
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Why don't you like the stock one? The MANN filters are great.

You could get something like this though---> http://www.europeanautosource.com/pr...oducts_id=2204
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Old 12-25-2010, 09:42 AM   #3
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Why don't you like the stock one? The MANN filters are great.

You could get something like this though---> http://www.europeanautosource.com/pr...oducts_id=2204
Exactly. Why would you want to keep cleaning (and it won't be 100% clean again, slowly getting dirtier) instead of buying new paper filters for $10 every 6 months as OEM intended.
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Old 12-25-2010, 10:33 AM   #4
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^+1 to both of these responses.
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Old 12-25-2010, 11:05 AM   #5
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Not to mention fkn up your MAF
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Old 12-25-2010, 02:38 PM   #6
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AFE dry.

No oil and better/freer air flow. Slight improvement over stock. I like mine.
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Old 12-25-2010, 02:39 PM   #7
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The one that was designed for your car.
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Old 12-25-2010, 02:44 PM   #8
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I run a K&N cone filter on my ECIS intake. For people complaining about it "fucking up your MAF"... that's what happens when you over oil your filter when you clean it. I've driven 7 years on the same filter cleaning it every 10,000 miles (recommended every 20,000) without a single problem.

An ITG drop-in is probably the best aftermarket filter you can buy.
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Old 12-25-2010, 03:14 PM   #9
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I've heard only good things about the AFE dry, having said that I just bought a replacement OEM filter instead because I could get it local
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Old 12-25-2010, 03:18 PM   #10
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AFE dry.

No oil and better/freer air flow. Slight improvement over stock. I like mine.
ECS, Bavauto...for $59.99 I'd get the pro dry too.
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Old 12-25-2010, 03:33 PM   #11
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I have been using K&N on all my cars for years; many many years. Never had a problem, but if your afraid, dont use it; use a lesser brand. Or you can simply learn how to clean, dry, and re-oil it properly. Then you will realize improved proformance and flow. The stock filter doesnt even come close to flowing the same amount of air; try this... breath through a paper dust mask, and then breath through your cotton tee; I bet I know which one you perfer and so does your engine!
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Old 12-25-2010, 05:22 PM   #12
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Get a Krap & Nasty. UOA results prove they let more dirt through to your engine internals than any other. Your engine will really appreciate that...............
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Old 12-25-2010, 05:42 PM   #13
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Originally Posted by Black E46 sedan;126133

You could get something like this though---> [url
http://www.europeanautosource.com/product_info.php?cPath=67_391&products_id=2204[/url]
I picked up one of those Macht Schnell's after using the OEM ones. Car pulls noticeably harder from 4k to redline...
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Old 12-25-2010, 08:47 PM   #14
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Get a Krap & Nasty. UOA results prove they let more dirt through to your engine internals than any other. Your engine will really appreciate that...............
Do us a favor and post those numbers. And when you're done posting those numbers... find us the ones that show the levels needed to cause damage. Otherwise....
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Old 12-25-2010, 08:49 PM   #15
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Quote:
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I picked up one of those Macht Schnell's after using the OEM ones. Car pulls noticeably harder from 4k to redline...
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Old 12-25-2010, 08:54 PM   #16
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Do us a favor and post those numbers. And when you're done posting those numbers... find us the ones that show the levels needed to cause damage. Otherwise....
another "talk alot" "know nothing" knocking K&N. I bet he never owned a K&N in his life. Furthermore, I bet he never saw first hand numbers showing how good K&N flow compared to stock paper elements. He's a bandwagon hopper who pushes the "oil gets on your MAF" like the rest of the ignoranaces.
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Old 12-25-2010, 09:10 PM   #17
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Quote:
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afe dry.

No oil and better/freer air flow. Slight improvement over stock. I like mine.
+1
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Old 12-25-2010, 09:39 PM   #18
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+1
ladies and gentlemen... here it is: a non-biased response!
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Old 12-25-2010, 09:56 PM   #19
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Any oil forum eg BITOG or NORIA has hundreds of UOA's where it's easy to spot who's using a Krap & Nasty, in fact they are the standing joke on oil forums and most international BMW forums as the only brand of 'filter', you can pick from UOA results. Particularly sad when you can buy filters that filter 100 times beter, better airflow, better built, no oil to screw the MAF, and don't look like they were built by your grandma in her kitchen, oh and cheaper and U.S built. The classic case of superb marketing over performance.
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Old 12-25-2010, 10:30 PM   #20
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One data point here - I used K&N before and it was bad making the engine dirty. Now I have the aFe Pro Dry and am happy with it. Not much performance difference though. Just personal preference.
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