you will need to get the old sleeve removed then they will have to bore the jug to accept the bigger sleeve, then they will have to match the ports on the jug to the sleeve.
i have this setup - i just sent it out to wildcard for them to do their magic on it to open it up. but it will not be as good as a vito's or others that have created a new jug and have the 12 port setup but it will have more power than a stock bore.