An awful lot of the bypass setups, have the outer pipe lap onto the bypass. Does this place the inner pipe too far inside and too close to the turbine?? I am not very familiar with the Bandit setup and I am sure many will chime in who are. But unless this place the bellmouth on the inner pipe too close to the engine or the discharge end too far inside the tailcone of the plane, I'm not sure you have a problem.
Roger