I think you might be hearing an exhaust leak, but I'm not sure from the description. Give it a few more days and a few more miles to seat in properly, and see what happens. My stock exhaust made a kind of chirping at stops, I thought it might be the drain in the bottom... might be your issue too????
2007 Versys Black, V35 Bags, H&B Bars, Skidmarx Hugger.Fender Ex., Avon Distanzia, Braided Lines, Hella 65W bulbs Arrow Can, DNA Air filter, GIVI tall screen (for winter), PCIII, Baldwin Saddle. **SOLD**
2011 KTM SM-T. Crash bars, E55 Top Box, Fender extender front and rear.