You need to remove the silencers, remove the clamp that joins the two 'sides' of the exhaust down pipes around the rear of the engine. The right hand side is smaller and is joined to the left with an exhaust clamp, and has to be removed first. Remove the clamp and twist the Right hand pipe back and forth to ease it away.
The left hand side has the collector attached, along with the ends into which both silencers fit. It is supported by a bracket and bolt up near the centre stand. That needs to be undone and removed. It will probably be completely rusted. Let it soak in something like PlusGas penetrating fluid, and use a 6 point socket, with a long breaker bar. Hammer the socket on if necessary to get a good fit. Hopefully it will turn, but my experience is that this thing will not undo, but it will shear. Thats ok, you would want to replace it anyway. That will allow the left hand side to be manoeuvred out.
While you are down there, with the exhaust off, take a look at the centre stand bolt - it slides into a long tube in the stand and it is impossible to get any lubrication in there without taking it off. And that is easier with the exhaust out of the way. Take it out, clean up the bolt and tube and grease it up with something that will stay put.
