Abstract: This disclosure provides a stationary gas turbine power system that develops a reduced back pressure for the gas turbine engine and thus greater efficiency. An enclosed ejector is positioned downstream of the engine's exhaust plane, and means such as a downstream diffuser cause the exhaust stream to entrain air from the ejector enclosure, by natural pumping action, so as to develop a sub-atmospheric pressure within that enclosure and thus at the engine's exhaust plane. This provides substantially improved engine efficiency. The diffuser recovers the static pressure to a level sufficient to drive any downstream devices.