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This is the wideband controller used in the closed-loop EFI system. A narrow band (open-loop) EFI system is set at stoich (14.7), and does not compensate for climate change. A closed-loop system like the Holley Stealth Ram kit uses a wideband and Bosch O2 sensor capable of readings from 10:1 to 16:1 to try to maintain the target air/fuel ratio of 14.7:1. It can account for altitude, pressure, and temperature.