Welcome to the forum. Hopefully @SCRBen will give you the full story on the Danmoto. He knows all the in and outs with that exhaust, good and bad.
My recommendation is to send your ECU to Ivan for a reflash along with the exhaust and air intake changes. That was by far the best performance mod of these few that I have done.
1) K&N air intake
2) opened up my stock exhaust with a 1.5" bimetal hole saw. :nerd:
3) Ivan's reflash
Have fun!