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      10-31-2014, 04:41 PM   #1
BMWZ4RIDER
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K AND N Air Filters

In place of replacing my OEM air cleaner with a cold air intake, which SEEM to have mixed revielws for N54 engine performanace upgrades, at a usually high cost ($600-$800) i am going to give a try with a K and N Air Filter upgrade over stock BMW.

Worst case is no performance changes, a life time, 1 time purchase, washable filter.

Best case-some HP and performnace gain even if minor and barely noticable.

I got the below filter from Bavarian Auto for $59.95.

I will install it (in 2 minutes) this weekend.

Any forum members with this minor upgrade and any performance related feedback IF ANY experienced?

2009 Z4-35i application

K&N 33-2367
Replacement Filters

List Price: $92.28
Your Price: $61.99

You Save 32.8%
K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. We make over 1,200 different replacement air filters for virtually every vehicle on the road. These filters are washable and reusable and are custom designed to fit into your existing factory air box. Their drop-in design means adding performance is simple. With most vehicles you simply remove the disposable air filter and replace it with a K&N. See applicable instruction sheet for details. Our stock replacement air filters for street vehicles are covered by our famous K&N Million-Mile Limited Warranty™ and will be THE LAST AIR FILTER YOUR VEHICLE WILL EVER NEED. [More Information on Replacement Air Filters]
Designed to boost horsepower and rate of acceleration
Can be cleaned and used again
High air flow with exceptional filtration
Lasts up to 50,000 miles before cleaning is required depending on driving conditions
Works with original equipment manufacturer vehicle electronics
Emissions legal in all 50 US states
Will NOT void vehicle warranty
Million Mile Limited Warranty®
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      10-31-2014, 05:15 PM   #2
RobC2
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I have one and didn't feel a difference. I bought it in anticipation of Cobb Stage 2+ coming soon.
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      10-31-2014, 06:38 PM   #3
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Yes you'll never have to buy another air filter. but who wants to clean that thing and oil it?
Care to read this from BITOG? http://www.bobistheoilguy.com/airfilter/airtest1.htm
I can save you some time - paper filters filter the best. That's what should be driving our decisions - Keeping the grit out of our engine oil.
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      10-31-2014, 06:45 PM   #4
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actually, the worst case is you over oil it and damage something upstream, like air flow sensor

OP, I think OEM paper filter is the way to go, or perhaps another paper filter if you can find one that is validated to have better filtration
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      10-31-2014, 07:26 PM   #5
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I am still fairly new to these engines, but I don't think we have the type of air sensor in our cars that can be damaged by the oil. I agree that paper filters the best, but I anticipate frequent oil changes due to the low mileage I drive to counter act some of that. The filter is part of my planned upgrade path, otherwise I would stick with paper if I was staying stock or close to it. In the end, I think it depends on your situation and your goals and everyone's are different.
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      10-31-2014, 10:26 PM   #6
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That's right - no mass airflow sensor in the N54.
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      11-01-2014, 12:37 PM   #7
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The one I bought is a direct replacement /drop in. No Oiling involved.
i give it a try.
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      11-02-2014, 03:02 AM   #8
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You do have to oil it once you wash it if it is a K&N or similar.

Let us know if you feel anything different.
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      11-02-2014, 07:40 AM   #9
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Quote:
Originally Posted by BMWZ4RIDER
The one I bought is a direct replacement /drop in. No Oiling involved.
i give it a try.
I thought all K & Ns were oiled filters. Are you sure?
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      11-03-2014, 06:39 AM   #10
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Quote:
Originally Posted by jparnes1 View Post
I thought all K & Ns were oiled filters. Are you sure?
yes fom K and N

Depending on your driving conditions, we recommend cleaning your air filter every 50,000 miles. To clean and re-oil, purchase our filter Recharger® service kit and follow the easy instructions.

With the 3-4000 miles a year I drive, there will be many years of driving in between cleanings.
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      11-03-2014, 08:45 AM   #11
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yeah you wont feel any difference. The ECU will auto tune out any gains as it is very strict with airflow.
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      11-03-2014, 11:15 AM   #12
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Quote:
Originally Posted by jparnes1 View Post
Yes you'll never have to buy another air filter. but who wants to clean that thing and oil it?
Care to read this from BITOG? http://www.bobistheoilguy.com/airfilter/airtest1.htm
I can save you some time - paper filters filter the best. That's what should be driving our decisions - Keeping the grit out of our engine oil.
Thanks for posting the link, it was an interesting read.
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      11-03-2014, 02:50 PM   #13
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I've heard / read of KN filters damaging MAP sensors as well. Unclear how much is fact vs. anecdote

As for goals, I've not seen intake or air filter actually be a meaningful power adder, but I could be wrong on that one.
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