300m: What is small "air-box" between air filter and engine?

Question

My '00 300m has a largish air intake box mounted over the battery (where the air filter is located) and a large 3" diameter corragated rubber hose running from this box to the engine manifold. But mid-way along this large hose is a smaller 1 or 1.5" side port that is connected to a smaller, irregularly-shaped plastic box - same color and type of construction as the air-intake box.

There are no ports or any sort of connections to this smaller box, and it looks molded in one piece (so I can't take it apart).

I can't figure out what the purpose of this box is, unless it's for some sort of esoteric function like impedance matching or resonance damping.

Anyone know?

Joe Pfeiffer · Accepted Answer

Yes, that's exactly what it is.  The FSM refers to it as the "air inletresonator".

MoPar Man · Answer

Ah, ok.Doing some web-searching on that term comes up with dozens of hits aboutREMOVING the thing, or about Ford Shelby resonator eliminator kits, butpractically nothing about what it does.I did find this:   "It's purpose is to alleviate the loud sucking noise that would    otherwise occur when the throttle body is sucking in air."Hmmm.Do a lot of cars have this?

PaxPerPoten · Answer

You do get that loud sucking sound from your Billfold when you purchase many of these vehicles.

GP49 · Answer

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It might be akin to what some owners of the 440 Magnum used to do: flip over the top of the air cleaner, which bypassed the noise-reduction of the snorkels. Made the 440 really ROAR when you floored it.

Most undignified for owners of overpolite, emasculated, "refined" cars like Lexus.

Joe Pfeiffer · Answer

Though, of course, the stated intent was to bypass the flow restrictionin the snorkels.

300m: What is small "air-box" between air filter and engine?

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