APEXi Digital AVC Type-R Boost Controller. It provides stable boost response. High sensitiveity MAP sensor, Heavy-Duty Solenoid Valve, and Super High Speed Processor. Functions includes: RPM based boost and solenoid duty cycle control, Scramble Boost, Gear Based Functions, Self Learning, 2D Map Trace Mode, Analog display, Real Time and Peak Hold data, Quick response and Stable boost control.