As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT FOUND RT SIDE OF NEW MUFFLER CRACKED OVER 50 PERCENT OF DIAMETER WHERE EXHAUST COLLECTOR ENTERED THE MUFFLER SECTION. THIS ACFT WAS 2200 HR O/H WITH NEW MFG FACTORY KIT COMPLETED 2/1/2013 BY AUTHORIZED MFG SERVICE FACILITY. NO KNOWN REASON FOR THIS CRACK TO OCCUR. WARRANTY MUFFLER BEING SHIPPED. INSTALLED SERVICEABLE EXHAUST SYS WITH TSN: 1808.5 UNTIL NEW PART ARRIVES.