Discover the pinnacle of performance with the Ferrari 355, F355, 456, 550, ECU Bosch 0 261 204 186 M5.2, a critical component for enthusiasts and collectors alike. With its precise engineering from Germany, this ECU promises a seamless integration with your vehicle, ensuring optimal engine functionality and reliability. This Unit is a working core and which you can just add your case. This came out of a running 456 GTA. Great to have a spare. Come in factory Ferrari parts bag. Well packaged.