The Shark Injector (Mfg#N4S54KAO) for 2001-2006 BMW E46 M3s (S54 engine)

By Turner Motorsport is a race version OBD II performance ECU flash. TheShark Injector (Mfg#N4S54KAO). It modifies the tolerances for O2 and EGT sensors, stopping the ECU from triggering check engine lights related to missing cats.