As sbrook333 said, the 1.9 mjt can be mapped and with very good results. The 1.8 can't, the best people to speak to are those over in the barchetta section
If you go on a website called celtic tuning and put your car model in and engine size it will tell you if it can be renapped and how much gain you should be getting
If you go on a website called celtic tuning and put your car model in and engine size it will tell you if it can be renapped and how much gain you should be getting