Man, I gotta' get caught up on this thread. I just remembered that Godspeed PMd me when he was coming through LA to pick those bikes up.
The Heck tanks shown on the 95 Dakar bike carried the weight too high. The later Rallye tanks (1997-2000) wrap in and around the subframe. They look more like saddlebags and lowered the CG.
The dual exhaust on the 1996-1998 Adventure was mostly a styling exercise. It looks like the Rallye and that's all that mattered. It used the Rallye head and mid pipes but had its own Y-tube and dual mufflers. Changing it to a Rallye style exhaust would be nothing more than changing the muffler.
Yes, it's vulnerable but it's fookin' cool.