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The BorgWarner EFR medium-boost actuator is engineered for use with 55mm and 58mm turbine-wheel configurations and is identified with a .64 notation. It supplies the calibrated boost-control response expected for medium-boost EFR setups and is suitable when replacing actuator hardware on matching EFR turbochargers. Fit this actuator to retain the intended medium-boost calibration on 55–58mm EFR builds.
BorgWarner Actuator EFR Medium Boost Use with 55mm and 58mm TW .64
