Having just been through something similar, if you want a 3" bridge, I would talk to MPI. Trent did my 3" bridge when I got the triple kit, and it did change some of the boost tube routing I think.
Depending on the routing for the charge pipe, it may also need to be rerouted from your current setup. I have a new appreciation for routing all that 3" tubing around inside the valley after putting my triple kit on.