Northstar Turbine is the manufacturer's representative for Global Turbine. Global Turbine overhauls large exit ducts for PT6A-28 and 34 series PT6A engines. Global Turbine's large exit overhaul replaces everything except the mounting flange. This means that Global Turbine can overhaul large exit ducts that others can't repair. For more information visit www.pt6pma.com. or email at [email protected]