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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N55 Turbo Engine / Drivetrain / Exhaust Modifications > 435i Intake flap?
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      09-28-2019, 01:43 PM   #1
Randy Johnson
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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
rphz
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Quote:
Originally Posted by Randy Johnson View Post
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...
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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      10-01-2019, 11:57 AM   #3
Randy Johnson
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Thank you for the reply. I don’t think I need it in south fla.
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      10-15-2019, 01:24 PM   #4
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Is the circled part in the attached picture what you are talking about? I just noticed this the other day.
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