Welcome to the forums by the way! If you are ordering the silencer new from mbrp it will come with a recommended jetting chart w/ temps and altitudes. You should also make sure they are not illegal in any of the areas you ride. And if you ride in a populated area it's never a good idea to annoy property owners.
you dont have to rejet for a silence alone. Also I would recomend the sno stuff rumble pack over the mbpr. the rumble pack sounds way better than the mbpr.