THE PLT EXPERIENCED INADEQUATE L ENG MANIFOLD PRES DURING A TKF ATTEMPT AT NEWPORT. THE TKF WAS ABORTED AND AFTERWARDS THE PLT DECIDED TO FERRY THE ACFT TO NEW BEDFORD FOR INSPECTION. THE ENG WERE RESTARTED AND OPERATION WAS GOOD. THE FLT TO NEW BEDFORD WAS WITHOUT INCIDENT UNTIL THE ACFT WAS ON A 2 MIS FINAL TO RWY 05 AT THIS TIME THE L ENG STOPPEDWHILE THE PLT ATTEMPTED TO FEATHER THE ENG, BOTH THE ENGINE AND PART OF THE L WING CAUGHT ON FIRE. THE PLT CONTINUED TO THE ARPT WITH THE FLAPS & GEAR DOWN AND A/S AT 125 MPH. THE PLT STATED HE WAS IN A GOOD POSITION TO LAND WHEN HE HEARD A LOUD BANG WHICH HE DESCRIBED SOUNDED LIKE A CABLE. THE ACFT ENTERED A 25 DEG L BANK. HE LEVELED THE WINGS BY REDUCING R ENG POWER. COLLOSION WITH TREES TO THE L OF THE RWY OCCURRED AFTERWARDS. EXAMINATION OF THE ACFT DISCLOSEDTHAT THE L ENG EXHAUST MANIFOLD HEADER ASSEMBLY, WHICH IS CONNECTED TO THE TURBOCHARGER, WAS CRACKED ALONG A WELD SEAM. ALSO REVEALED WAS THAT THE AILERON CABLES THAT ARE ROUTED BEIND THE L ENG WERE BURNED TO SEPARATION.