EcuTek BMW F-Series N55 and S55 RaceROM is here! And what a package it is. Some BMW firsts: On the fly, while driving, instantaneous map switching x 4 modes. Self adjusting, FlexFuel (Sensor required) as per our GT-R product; Custom Maps with a wide range of inputs and outputs which in turn can be used to create up to 5 Custom Inputs into ECU Connect to control your tune from your phone with buttons or sliders. There are many more features which you can see by clicking on the link below. Your N55 and S55 will never be the same again!