that problem with transparancy always heppens, i can give you a brief explanation right now.
if you give a model transparancy, its fine without any collusions to other like models, the turbo aura has a transparancy layer on it too, when the 2 models collide, the top one wins, because your aura is bigger then the model, it covers it and removes its layer, the only way to stop this it stop using transparant turbo models.