I dont know how much the price would be to redo the tunes, but If you already know what you are getting then I would order the tunes now, they are taking 3-6 weeks from what I understand... but I am probably wrong since I havent ordered tunes for a while. You can always order them, and then once you put the new stuff on you can update your gryphon at the same time.
I wish I could help more, but I cant, so yeah... just dont have too much fun with the new exhaust when you get it!
