KEELO

hey all new to this so just asking around. i have a audi a3 8P 2.0l Tdi 170 and was wondering in the future to upgrade the turbo and all that goes with it. does anyone know where i could find one or does the turbo out of the a4 3.0l tdi models fit + the fuel injectors? as that cars around 300bhp stock. any help would be much appreciated thanks