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      08-11-2023, 09:02 AM   #10
B21
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Drives: E89 Atacama Yellow 35is
Join Date: May 2022
Location: Scotland..God’s own country

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I saw that chaps video when I was pondering a cold air intake AFE style

I think we can agree that K+Ns are not good at filtration.. a stock Mahle filter is pretty good (i've been use Mahle filters on all our cars for the lasy 7 years)..everything else is in between.

I've created an unknown with a Mr.5 mod as we have no idea how much air flows though the stock airbox and its filter and the Mr.5 inlet with its Pipercross foam filter.

It will vary at which throttle / rpm seting you are at..

However it will be filtering better than a pair of K+N DCIs..

I'm now going to start doing regular engine oil sampling..that will give an indication of how much dirt i getting into the engine..
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Much modified 2011 Atacama Yellow 35is…previously a much modified 2012 Atacama Yellow 20i MSport
Change history here… https://www.dropbox.com/s/8h1vabklgz...0List.pdf?dl=0
Build thread here… https://z4-forum.com/forum/viewtopic.php?t=131886
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