Can anyone tell me what this box does??

[32godzilla]

Hi all,

I was re-aligning my bumper today and found a strange looking plastic box (see pic), with a duct attached. The reason I say strange is that air feeds into it but doesn't go anywhere, the only thing connected is the incoming air duct.

I know this is trivial but I'm curious. Anyone got any idea??

[SteveL]

It's a resonator box....the idea is to reduce pulsations in the intake system.

[32godzilla]

Thanks Steve, any idea how it actually works?

[SteveL]

Well, as I understand it, pulsations in the intake (which are pressure 'waves' that travel up the intake pipes) 'expand' into the resonator box and are effectively damped out.....OTOH, some argue that it just interferes with airflow, they may be right as I certainly don't claim to be an expert