AEM 30-2340 4-Channel Wideband UEGO Controller Multiple units can be paired together for use on 6, 8, 10, 12 or 16 cylinders; compact (4.8 inches x 4.55 inches x 1.44 inches), weather and shock proof enclosure Two status lights per sensor for error detection and operating status No free air calibration required - ever; four unique differential analog outputs; CAN output for use with AEM EMS or CAN enabled devices and exhaust back pressure compensation to correct AFR readings on wideband sensors mounted pre-turbo Reads gasoline values from 8.5 to 18:1 AFR, E85 values from 5.7 to 12:1 AFR, ethanol values from 5.2 to 11:1 AFR, methanol values from 3.7 to 7.8: AFR, lambda values from 0.58 to 1.22 AFR Stainless steel bungs specially designed for use in individual port applications which feature a finned stand-off design which both cools the sensor body and minimizes exhaust port restriction