Search Facebook for DR650 riders group, also google search DRriders.com
You will find both these sites very usefull. Many Dr650 owners have turned their 650's into 800's, one company in the U.S is even playing with a 900 modification.
Also try contacting Jesse Kientech @ kientech engineering .com, he's a bit of a guru with DR's.
An option of using a can off a GSXR with an adapting mid pipe (between header pipe & GSXR can) may be available. Also contact procycle.us they stock heaps of gear specifically for DR650's.
I used all the above sites when researching modifications on my 650 & I'm still a regular on the FB page.
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