You have to play around with it but I like the stock DB inserts the best. I've gone through the exercise of trying each out for a week or more and I always come back to those. They sound good too
Make sure before you put em on get comfortable with TuneECU or set up some dyno time, most likely it won't run very well if you just throw em on without a new map. I like Wayne Tripp's Acro map, but try some different one's and see what works for you, each bike has it's own set of rules.