There's gentlemen that built 1/3 scale V10 engine, and used a full scale stand alone fuel injection system, I believe he used a mega squirt system. he used the ECu,and then made his own miniaturized fuel injectors and modified the ignition coils, and sensors. He's very skilled, Built a 1/3 scale RC car to put it in. The mega squirt is fully programmable, it runs quite well, but I can only imagine what he has invested in it, the time he put into the project is obvious from the fit & finish.