As mentioned, it's quite common to modify the stock Ducati Mufflers by removing the internals and putting in a straight through perforated pipe. From memory the 400 Duc's are good for about 50hp so you won't be gaining a whole lot other than some extra noise. The good news is that if you find a bigger Ducati motor from the Monster range you can transplant it into your frame as they all have common engine mount points. You'd wanna upgrading to twin discs up front if you go down that road, and if your rear wheel isn't already a 5inch then you'd want to be looking at that too. Of course it usually ends up being cheap enough to just upgrade to a bigger one anyway!
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