I have the chatter, and it's not too bad. You'll hear it at very low speeds in 1st or 2nd especially getting up the drive way into the garage. During normal driving it is barely noticeable. You'll probably hear tire noise more, and it does not drown out the exhaust note.
A few of my friends hate the sound and think it's a loose flywheel. I tell them it's normal with a single mass.
If you decide on a new flywheel, you might as well consider a clutch and CSC upgrade.
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