It's a vibration dampener that reduces Noise,Vibration,Harshness. If it's rattling then it is either loose or defective. Aftermarket exhausts don't have these and are fine without them so tighten or remove it or replace it if it's defective.
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Red 2012 370Z Base Sport 7AT, ExoticSpeed CBE, 13.0@109(sold) Q50RS400AWD 12.2@116 JB1 CBE
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