As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A 2 INCH LONG PIECE OF THE EXHAUST PIPE MADE OF STAINLESS STEEL, PROVIDED BY ROTAX (THAT PART THAT FITS INTO THE CYLINDER HEAD), BROKE DUE TO FATIGUE. OPERATING A PUSHER CONFIGURATION, THAT WHOLE EXHAUST PIPE WENT THROUGH THE PROPELLER AND TOOK 2 BLADES OFF.