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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > what exactly does this do



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      02-21-2012, 06:35 PM   #1
magic77
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what exactly does this do

Just wondering about this hose off the airbox if anyone knows

In real oem its item 10 on this page



Listed as SUCTION SILENCER/FILTER CARTRIDGE
any ideas how this function and is it really needed.

If its just there to make the induction noise quiter they why would I want it

thanks in advance
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      02-22-2012, 09:53 AM   #2
m1bjr
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Could be a 'tuned' stub to reduce resonant noises I guess.

A Helmholtz resonator?

Not connected to anything then?
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      02-22-2012, 05:46 PM   #3
magic77
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connects to the air box underneath if I recall from when I had the bumper off to do the brake ducts
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