Can i ask what size silencer can you used??
I have a spoon N1 myself and im going to be replacing the can with a slightly bigger one as mine has shot all its packing anyway. Im thinking allong the lines of 6"x14" (2.5" pipe of course).
I know it feels like sacrilege to chop it up but it allready has a true 2.5" flat flange welded on and the pipe work is like new. Plus making the piping over the arm is a pain as i hate the crimped pipe from a pipe bender. So i may aswell re-use the pipework.