Have such a question! What information do I have to pay attention to when buying a chip? My control unit has the Boschnr. 0 261 200 273. Is that enough as an indication, or do I have to pay attention to other information. Is not that the super screwdriver, but also net quite stupid. Is it then also possible to install the chip itself? Is such a thing stuck or soldered? Do you have experiences with chiptuning, or does that not result in so much???? I am grateful for every answer?