They made a slight change in the hull design to lessen porpoising and changed something in the electronic locks. I think all of these changes were on '06 models and maybe a few very early production '07 models. If it is new on a dealer lot, it was probably built later in the year, or had the upgrades handled by the dealer already. I'm sure someone will be along shortly that has more knowledge that me.
Does it have a 250 or a 300 on it?