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#1
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K&N Air Filters
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#2
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They let a lot of dirt into the engine. In my opinion, I would only use the factory filters.
Craig |
#3
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I wouldn't put one on any engine I cared about. Others will have contrary opinions. I liked a previous suggestion from X5 in AK, who posted that one option was to remove the filter entirely, and see if you notice any power difference. Any low restriction air filter (whether it is low restriction or not is another subject entirely) is going to give you only a small % of the difference you feel with no filter. So, either put a K&N in or put the original back in. Note that any consequential damage to your engine from running with no filter, or with a filter that performs less than the OEM filter, will cause you to be responsible for engine damage. That includes dusting the engine, or mass airflow problems due to improper oiling of the filter.
I did a quick search on 'K&N filter' and found 81 posts. This was the most recent: http://www.xoutpost.com/x5-e53-forum/...t=K%26N+filter You may want to do the same search and see what is there.
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue |
#4
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As mentioned, K&N filter have been known to cause problems due to the oil coating the Mass Airflow Sensor on many cars. K&N claims this only happens if the filter is improperly recharged with too much oil, but if you don't get enough oil spead properly, it won't filter well, and if you get too much, you have an MAF problem. And, in general, opening up the intake flow does little for engine performance unless the exhaust system is also "opened up." I see little reason to go with a K&N, except for cases like prolonged off-road operation in dusty areas, where a high-capacity cleanable filter might have some benefits.
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