Thank you very much for your answer Pdegene
From what you wrote and from what i heard, i assume ECU remapping is a better option. I have already found few companies in my country (Serbia) that provide this service and also give you a warranty, which i think is very good and it also makes me feel safer about tempering with my car.
I will make an appointment with one of them and discuss all the options they can offer and eventually i will make up my mind.
Thank you again for your advice and a detailed answer
Take care