Definitely part of the intake tuning. It looks like an expansion chamber to change the resonant frequency of the system. You get to decide if it is important on your car. A brief reference on similar designs:
Patent US5572966 - Method and composite resonator for tuning an engine air induction system - Google Patents
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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