OEM Exhaust

Has anyone altered the stock exhaust on a KZ1000P? Can they be altered? Such as tips be drilled to remove the any baffle material. Just thinking about creating a better sound. 

The baffling is probably welded steel tubes & plates.
Here's a couple of pics of a KZ750H Ltd. there's other stuff inside the muffler.
The 1000P is probably similar. just guessing.
Some of the 70s manuals have a cutaway view diagram of the muffler baffling.


In case it needs to be said the muffler has broken off at the weld. One of my mufflers broke off similarly.

650 but expect they are all pretty similar. 

I also have a stock exhaust on my KZP. It's heavy and quiet. I don't see how you would remove the baffle without destroying it. You'd probably be better off replacing it with a 4 into 1 and selling the stock exhaust. As for me, the older I get the more I appreciate quiet bikes and cars.