Self-learning EFI systems like these four will perform well as long as the system is properly installed and you follow a few helpful tuning tips. Yes, even self-learning systems need a little assistance. On the engine is the FAST EZ-EFI 2.0, on the lower left is the FiTECH, lower right is the Edelbrock, and in the upper right is Quick Fuel’s QFI throttle body. http://www.powerperformancenews.com/tech-articles/how-to-tips/self-help-efi/