No, it would be too far from the turbine tailcone to start of the parallel exhaust tube.
Ignore any inlet cone and concentrate on the actual gap. On a 260 I would say 1 1/2” (40mm) maximum depending on the pipe diameter the sweet spot is probably 35-38mm.
BUT I think that is airframe inlet design, not turbine gap. It whistles off power, where normally it will whistle adding power. You can hear the turbine acceleration and it sounds normal.