1st question: no you won't need to remap - the S&S map should handle the new pipes fine. A small tweak with the dealer computer may be required, but I doubt it.
2nd: I would not recommend cams in that year bike without any motor work. All the aftermarket cams avalable are going to KILL your low-end power. Unless you do all your riding over 4000 rpm's then you'll be doing yourself a disservice IMHO with just cams.
Now cams and a pistons on the other hand..........
The Vic Shop, Inc