09-28-2019, 01:43 PM | #1 |
BM3
370
Rep 891
Posts |
435i Intake flap?
There is a small trap door in the oem airbox on the 435i. Wondering what this is for. Tried a search but came up dry...
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09-30-2019, 07:42 PM | #2 |
Second Lieutenant
70
Rep 206
Posts |
It's a "snow valve" that is intended to open in the event your main intake pipe feeding the intake box clogs with snow. If you go to Dinan's website and take a look at their instructions for their cold air intake, they mention it (and how to bypass it in order to install their intake).
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