Break-in?

Just bought a new MS6 with 500 miles from the dealer. What's a good break-in procedure for the engine/turbo?

I think you are already broken in, and then some. Hell, mine was a lease, I never broke it in, because I'm sure people already broke it in for me. It had well over 100 test miles on it, and I'm convinced previous people pounded on it, so I thought why bother. I doubt you have 500 pampered miles on yours, and that car already has been revved and driven hard, so I wouldn't worry about the break in. If you want to think that perhaps the previous 500 miles were driven pampered, then go another 500 taking it easy, but you are probably wasting precious fun time. I wouldn't worry about it now. Just go out and enjoy the performance.