I believe it was the sport pipe. Sent them an email and picture of the broken pipe and never got as much as a sorry.
Got a couple sport pipes on members bikes here, they ride hard but no issues.
It would be interesting to know WHERE it broke, as the pipe is OEM Harley with the center section replaced.
IME, especially with OEM head pipes (pre-09) cracks usually develop due to strain on the mounting.
Not to say there may have been an issue with quality control, but IMO that would be a long shot knowing how detail oriented Fullsac is.
They are usually pretty good returning phone calls, it may take a day or two, but, I've always received a call back.