SL-Class (R230) 2003 -- 2012: Discussion on the SL500, SL550, SL600

SL/R230: k&n air filters

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Old 06-26-2010, 10:16 AM
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2004 sl500
k&n air filters

het all,
my first post!! just got a 04 sl500 and was wondering if anyone has any thoughts on air filters. usually put k&n's in all my vehicles, this is my first m-b so any advice is appreciated. thanks
Old 06-28-2010, 07:07 AM
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03 SL500
Originally Posted by smartbomb
het all,
my first post!! just got a 04 sl500 and was wondering if anyone has any thoughts on air filters. usually put k&n's in all my vehicles, this is my first m-b so any advice is appreciated. thanks
Congrats! I have the K&N in my 03, after driving for about 6 months, I have to replace my MAF. I am not sure the cause is by the filter, but, I don't really see too much improvment.

Just my 2 cents.
Old 07-05-2010, 12:43 PM
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I have been running K&Ns in all my cars for years with nothing but great results. When we tune cars, I recommend a free flow filter, as it improves the air flow and we write our software to take advantage of it.

The only time I have seen problems is when the filter is 'over oiled'.
Old 07-05-2010, 12:46 PM
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Some people have problems with K&N and some people love them. My experience wasn't great, I ended up switching to Green Filters. You could also go with BMC washables.

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