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      01-19-2014, 08:11 PM   #15
jphughan
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Drives: '16 Cayman GT4
Join Date: Mar 2011
Location: Austin, TX

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Nice write-up OP! But if one of the four filters does nothing, does it need to be replaced? I assume if it's sealed off from any air flow, it should never get dirty, so I wonder why BMW doesn't just sell them in sets of 3 and have a dummy bit of plastic in the fourth slot....
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'16 Cayman GT4 (delivery pics, comparison to E92 M3 write-up)

Gone but not forgotten:
'11.75 M3 E92 Le Mans | Black Nov w/ Alum | 6MT (owned 5/2011 - 11/2015)
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