I took the car to my dealer last week to get the rattling resolved. They replaced the 4 carbon tips for new ones, but they still rattle. Yesterday I placed some aluminum tape on the exhaust, but it didn't help. I guess it's not thick enough to make a difference.
I guess I'll ask my dealer to replace the tips again, but this time for the newer style tips (part number 18302468411). These tips are shorter and have a different mounting mechanism (a clamp instead of a single screw).
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Not sure if these fit the MPE tho.