ARacer RCmini X is a Complete engine management system that allows you to make all adjustments via wifi to your smart phone/tablet. Pair this up with the correct fuel injector size and you could easily tune your engine to run. Tuning could be done on a dyno (highly recommended) or safely on a backroad/street using a wideband o2 gauge and sensor with the autotune function. Optional AF3 option is available and recommended to be used with the RCmini X to have the ECU Auto Tune. Fast 4-core MCU speed Processor. 20x17 (RPM x TPS%) fuel adjustment 20x9 (RPM x TPS%) ignition angle adjustment (pay to open another 2 MAP) Manifold Air Pressure base for inlet air amount calculation Environment temp and Baro compensation available Increase Rev Limit. Pit Limit. Increase almost 10% above power after calibration (depend on engine model) Easy plugin (remove stock ECU and install RC mini X ECU without any harness modified) Same connector as stock ECU RCmini 5 ECU meet IP67 specs Support Auto-Tune with aRacer AF3 wideband sensor module Built-in Wi-Fi and 360-degree antenna design (no additional wiring required), the connection signal strength is increased by 200% over the Mini X. The AF3 module module can be found HERE.