Mosselman iTronic S58
The iTronic is an advanced engine controller that works simultaneously with the original ECU and is highly recommended on new and young BMW models that still have the factory warranty. It is designed as an external module (tuning box) that can be installed and removed by the end-user, minimizing problems with the factory warranty. It requires no reflashing, is equipped with a powerful dual-core processor and is protected by a carefully machined aluminum housing, and is plug-and-play. The installation time is approximately 1 hour.
The iTronic is available for the BMW G-Series M3/M4 (Competition) and will take the performance to approximately 600 hp and 750 Nm on premium fuel (98 Oct EU/ 93 Oct USA), which is highly recommended.