Mosselman BMW S58 iTronic Engine Controller Tuning Box For BMW G80 M3, G82 M4 & G87 M2The Mosselman iTronic for the S58 engine found in the BMW G80 M3, G82 M4 & G87 M2 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. The iTronic will take your BMW G Series M3 M4