There is an update, atleast in 08 there was. Not sure if they updated it yet again. If you have an 07 model make sure to get the proper mounting hardware for it as well, otherwise it just flops around.
Not meaning to hijack the thread here, just wanted to pass on a thanks to you guys, Yamaha hadn't sent me a notice about the vent update, took my Grizz in today to get clutched and had them do the update. Thanks again guys!