Re: Stelvios, any dealer can get in Guzzi's system with the VIN number and find out if cam upgrades are done or not, and which ones. Don't know what records (if any) are available on the hydros.
I love my '09 Stelvio, and had the rollerization done this past fall with 11000 miles on the clock (just barely showing a bit of wear, so no harm done.) I figured if I keep it, which I intend, I'm all set, and if I should decide to sell at some point, I can do so with a clear conscience.