L/Ts and Magnaflow X w/cats

I want to get BBK L/Ts but I'm not thrilled about taking off my $400 magnaflow X w/ cats just to buy another mid-pipe so it will fit the long tubes. If I put the long tubes on myself, would a good muffler shop be able to cut my x-pipe and flange the ends so it bolts up to the collectors on the headers? Would the cats get in the way of making those connections???

thanks for the help