What year M7? There has been some debate on this, but I don't think there was ever an official Update for the m7's. I thought the mapping on the 2006 was pretty good, and I was still able to add y-pipe, pipe, and can without adding a Fuel Controller Box.
Cool: For a single Pipe I suggest the D&D Power Lite Pipe, which includes the Y-pipe. I ran this at 0-3000 Ft. Elevation and it ripped, at elevation I hear the Y-pipe does not make a huge difference, but in the lower elevations it will. FOr a can I fully suggest any of the Skinz products!