HDi MAX-ROM is the most economical, simplest and easiest way to install and tune modified vehicles wiht only a few wires to be connected. It allows the user to alter the ignition timing,air-fuel ratio, boost cut limit, it also allows an extra 4 injectors for extrme modifications and that's just to mention a few function. The HDi MAX-ROM system features a list of preset requirment so all you need to do is to follow the instruction to the preset specification and you will have reliability, improved fuel economy and plenty of power to rocket you when needed. HDi MAX-ROM increases the efficiency of the vehicle, and if he vehicle is modified the HDi MAX-ROM also can extract and optimize the extra benefits from the installed performance parts.