I had the D407F tire from the factory , it started to make noise around 2,000 miles.
At 5,000 miles I asked about it at the dealer , they knew nothing about it.
I mentioned it again at 10,000 miles and they said it was just a bit noisy.
At 10,400 miles they replaced it no questions asked.
It wasn't cupped that bad , but the noise was driving me nuts , sounded like a snow tire on the front.
The D408 seems much better , but it makes quite a "whirring" noise since new.
I guess running stock mufflers just make things worse , as I can hear everything , everywhere , really well.
I still had 3/32" at the required measurement location on my D407F , so the replacement was free.
Mick