As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXHAUST CLAMP CAME LOOSE IN-FLIGHT ALLOWING EXHAUST STACK TO COME LOOSE FROM THE TURBOCHARGER EXIT PORT ON THE LEFT ENGINE. HOT EXHAUST GASSES BLISTERED THE PAINT ON THE AFT CENTER OF THE COWLING. ENGINE WAS SECURED/FEATHERED AND UNEVENTFUL LANDING ACCOMPLISHED.