what is the function of this part on the intake manifold

[edmundopt]

I removed some stuff from the engine to check the mechanism of the gearbox, and when I was looking at the intake manifold found that part
can someone explain what is the theory behind that ?
[attachment=0:2n9l3zrc] ia0 20170514_155706_1.jpg ia0 [/attachment:2n9l3zrc]

[SteveJ]

Tuned resonator - reduces intake noise at certain frequencies.

[edmundopt]

oh, thanks, I was thinking about some air flow modifier, so its sound focused, allways learning  s:) s:)

[jonbill]

I was wondering about that too [emoji106]

[Essex2Visuvesi]

Has anyone removed it to see what differences there are?

[mr mr2]

Lots have when making a induction kit I've not had one on for years my exhaust is loud so can't really tell


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