Abstract: A device is provided for increasing the power output of a gas turbine engine at the low ambient inlet temperatures which would otherwise produce a decrease in power. The device includes a conduit for bypassing a portion of the compressor discharge air around the combustor whereupon it is reintroduced back into the engine downstream of the compressor-driving turbine and upstream of the power turbine, if any. A valve is provided to increase the bypass flow rate through the conduit at low ambient temperatures, the increasing bypass flow permitting the engine to operate at a higher fuel flow and cycle temperatures for the same compressor mass flow. The increased temperature with the same mass flow rate results in an increase in power.