As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED OCCASIONAL EXHAUST FUMES IN CABIN. CONFIRMED THAT THE CREW SMELLED EXHAUST ON ROLLOUT WITH PROPS IN BETA AND HAD SMELLED IT AT AN ENGINE START (AS IS COMMON WHEN STARTING WITH A TAIL WIND). MX LOCATED A CRACKED HEATED INTAKE LIP STUB PIPE ON THE LT ENG INBD EXHAUST STACK AND REPLACED THE STACK.