So I have been running a 2-1 setup with a de-cat stock muffler for a while now. It's just as hot as before and really made no difference in sound or performance.
My next route is to use the outer of the stock can and replace the innards with a perf core and lots of packing. Im sure it will be loud, require a re-jet, and still be relatively heavy but it should be much cooler. Im have a stock muffler off an 08 CRF450 that i am going to rob the innards from. I'll report when I finish it...
Kyle Montagne #141K