Quote:
Originally Posted by Lacroix1
On my newly acquired M2, I installed a drop-in K&N filter at about 150 miles, unfortunately, before reaching 200 miles, I got a Check Engine Light. The car has been at the dealership since yesterday and they're telling me that I have an overheated crank hose that needs to be replaced. Not saying that the K&N caused it but the CEL came up within less than 50 miles after installing it. I did some search online and found that the OIL in the filter could trigger the CEL and may affect your MAF. I find it hard to believe, I've had a K&N filter on all my previous cars and never had an issue but thought I would caution everyone considering one to do a little research. My situation again may or may not be related but awfully close to suspect it!!!
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If you see the video that is what he was against, the oil on the filter. He washed it off completely to avoid getting anything on the MAF.
I've always believed it doesn't improve whp like they say but it does enhance the sound of the intake. But like someone posted it would be interesting to see a side by side dyno run.