As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MUFFLER SENT IN WITH MUFFLER BODY WORN 50 PERCENT OF THE WAY THROUGH. MUFFLERS ON THIS MODEL ACFT WILL ALWAYS WEAR REGARDLESS OF PMA, OEM, PDA MFG. THIS MUFFLER IS A OEM UNIT. MUFFLERS CONTACTING EACH OTHER CAN RESULT IN FAILURE OF THE END OF THE MUFFLER, AND OR BREAKAGE OF THE EXHAUST STACK WHICH CAN LEAD TO IN FLIGHT FIRE.