At hitting 130K miles around, recently I've heard some rattling sound at the back of my Z when it is stopped on R or D mode with braking.
Today I got my Z checked at a dealership and they said it needs to be replaced. Then I went to a muffler shop, they failed to fix it, and also said the same replacement (but maybe with an used one on cheaper price - still around $200)
I've really done my best for all maintenances, and never been to the track. I even don't think I'm a hard driver.
Is this stock muffler issue common? I cannot understand why it happened, and feel somewhat sad.
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