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M2 Technical Topics > N55 Engine / Drivetrain / Exhaust / Bolt-ons / Tuning > [How To] Installing a K&N air filter

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      10-01-2016, 08:46 AM   #1
J.M
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For the ones less accustomed to car related DIY:



Could be quicker, but still easy enough and shouldn't take longer than ten minutes to do. Only required tool is a 10mm wrench.
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      10-02-2016, 06:38 AM   #2
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So, is it worth it when it comes to sounds/performance?
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      10-02-2016, 06:48 AM   #3
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Originally Posted by Yellowflash21 View Post
So, is it worth it when it comes to sounds/performance?
In terms of sound: yes. In terms of performance: most likely not. For the price point (about 75€), I guess it is an nice mod though.
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      10-02-2016, 02:58 PM   #4
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I was told that the oil used on these filters can mess up the Mass Airflow Sensor? Any comments on this?

I had the K&N in my 97 M3 but I don't think it did much! I re-oiled it according K&N specs, but I don't think there was much overall money saved vs buying a new air filter every year or so.....

I doubt there is any measurable change in performance.

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      10-02-2016, 03:24 PM   #5
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Quote:
Originally Posted by Aronis View Post
I was told that the oil used on these filters can mess up the Mass Airflow Sensor? Any comments on this?

I had the K&N in my 97 M3 but I don't think it did much! I re-oiled it according K&N specs, but I don't think there was much overall money saved vs buying a new air filter every year or so.....

I doubt there is any measurable change in performance.

Mike
Establishing a correlation is hard, even more so a causation.

I always put K&N filters on my cars and never had any issues whatsoever. Every aftermarket induction kit or panel filter works with oil and it is an extremely common mod to make.

As for performance gains, this alone does close to nothing but together with a sports cat or a cat less DP it allows for big gains to be made with a remap/piggyback chip tune.
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      10-02-2016, 03:44 PM   #6
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Quote:
Originally Posted by J.M View Post
Establishing a correlation is hard, even more so a causation.

I always put K&N filters on my cars and never had any issues whatsoever. Every aftermarket induction kit or panel filter works with oil and it is an extremely common mod to make.

As for performance gains, this alone does close to nothing but together with a sports cat or a cat less DP it allows for big gains to be made with a remap/piggyback chip tune.
I bought the BMW Performance intake for my E90 330i and it came with a KN filter. So if the factory ships them with their own aftermarket intakes I wouldn't worry about any issues.
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