Anyone know what the stock rear camber should be? I noticed from the sand my tires picked up that there appears to be some negative camber in it.

 

I would guess stock rear camber should be about -1.0 degree, but I don't have any offical documentation to back that up. A bit more camber will buy you a bit more stability in corners, and a bit less camber in back will buy you a little better rotation in the corners. At least that's my experience with the R53. The rear suspension on the R56 is very similar.