As for a turbo charger upgrade I have no idea.
But I would remove the tuning module ASAP. A proper ECu remap is far far safer and will give you more torque and a smoother drive.
Plug in 'boxes' to my mind come in two varieties. 1. Useless and harmless. 2. Mostly useless and very very damaging to the engine and emission controls.
Get ir mapped - you'll been blown away by the results