Lots of difference... kompressor engine has lower compression, forged rods/pistons, more fuel being injected, ecu progarmed to read everything... etc. Its also mated to a tranny that can handle the extra power. Oh, and had bigger brakes to slow done a faster car better (but now I am getting too far away from the engine difference).

I have done the turbo kit thing and wont do it again because its cheaper and more efficient to just buy a turbo car. But do to you situation in Greece where you are taxed upon engine displacement, I say go for it...