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      10-26-2014, 08:44 AM   #3
Helmsman
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Drives: 2011 E90 M3 ZCP
Join Date: Mar 2014
Location: Stockholm, Sweden

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Yep, worth open the airbox even if filter change isn't needed just to keep the box reasonable clean. Mine had quite a bit of sand and stuff in when I bought the car at 11.5k miles. 10min job. Be careful when tightning the sqreews to not break the plastic.

Cheers