in the same direction as lobe 20 and likewise forms chutes or channels 28 these chutes are precisely configured to effectively mix the exhaust core flow and fan flow for an overall engine performance improvement and effective sound suppression the lobed mixer per se is well known and does not form a part of this invention in accordance with this invention the mixer is formed with guide vanes 30 that project toward the engine center line from the bottom of the inner lobes and extend from the inner diameter surface of the wall forming the bottom of chute 27 guide vanes 30 may be viewed in this embodiment as fairings of the bottom wall of the inner lobes as can be seen best in fig5 each vane 30 is contoured to receive the exhaust gases from the rotating turbine 12 it will be appreciated that this flow which has a high tangential velocity component will strike against the guide vane turning the flow with substantially no pressure losses inasmuch as the velocity at the inlet will be nearly equal to the velocity at the outlet plug 34 which is aerodynamically streamlined is centered in the mixer 16 forms annular passage 36 and is contoured so that it circumferentially bears against the apex of the lower lobes 20 defining a top cover for chutes 28 trapping all the core flow so that it all passes therethrough the gap between the plug and the annular wall 22 which.