Dr200..I want to Jet it out

Does anyone have any reccomendations on how to make my DR200 faster and make it sound beefier? 
 
Thanks

Here is what I did to my '96 DR200SE - found this on the web somewhere and it worked very well and sounded real nice!

1) drilled a few 5/16" holes in the airbox for more air flow
2) put on FMF Turbine Core2 pipe (its meant for a 2 cycle universal fit but it fits nice with little modifications)
3) experimented with jetting and ended up with a 140 main jet - spark plug was always the proper color so it wasn't too rich or too lean. also had to adjust the low speed mixture.

Here's a pic of the pipe on it.
http://members.aol.com/rbris66/images/96dr4.jpg