Hey man this is pretty common, there is alot of info on sites like nissancustoms.com. Using a router can be done, but will really mess up balance etc. Just go to a good machine shop and get them to bore it, I just got my Denali wheels done for dirt cheap. Titans only have to bored about half way, enough to clear the hub, so do some measurements, and go to a reputable machine shop. BTW you need the center bore to be 4 inches for a harbody (any year)