oh yes it can be done! i did it to mine. In fact, doent make the bike much louder. just more of a "popping" sound instead of the GR GR GR.
heres what to do:
1. Take apart the silencer
2. put on the outer shell, onto the inner one/pipe end
3. Cut it to desired length
4. take off about 1/4 inch or so to the inner piece
5. cut muffeler packing to length
6. drill the new holes for the end cap
7. use self tapping screws to hold it back together
This mod looks AWESOME, and isnt really any louder if you have a stock pipe.
For a pic of mine... go to
www.geocities.com/kdxfreestyle200/
if you have any more questions, post them here, or e mail me at
XR100Man18@Hotmail.com