Air box question

[dale197338]

Was checking things out under the hood today, pulled the air box apart and noticed a mess type device plastic riveted to the lid of air box??? What is it's purpose. 2018 ram sport 5.7L

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[2966]

some kind of emission filter for when u shut your truck off ,for intake fumes coming back in airbox .read that somewhere ...pops off with screw driver been divin a yr without it...just a air restriction imho