[ronr]

I don't believe there is any difference between the 06 & 07.

I had an 04 and pushed it hard (maggied car that occasionally sees the track). It had a mild whine at multiples of 43 mph (43, 86, er...) and was ultimately replaced under warranty for an 06. My whine was not nearly as pronounced as I've seen others describe here on the forum. I did twist one of the cv joints on the half shaft going to the passengers tire (inboard I think). This too was replaced under warranty.

The 06 has been flawless. The only issue I've had since installing the 06 is a "clunk" that has been corrected and returned to be corrected again by the dealer. I asked for a detailed description from the tech this time to see how he fixed it and it was simply the pinion mounting bolt that attaches the diff to the cradle coming loose. I'm considering a BMR pinion support (or a DIY version of the same) to make this stop.

The 08's will have a very different rear diff which I believe will be common to the 08 STS-V and 08 XLR-V.