> Older cars aren't subject to smog protection and if the module is set to the OEM configuration it will. Only cars prior to 1974 are not subject to smog check

> Older cars aren't subject to smog protection and if the module is set to the OEM configuration it will. Only cars prior to 1974 are not subject to smog check in California. And part of the smog check is a visual inspection which will fail in the presence of any non-factory emission related equipment (such as engine control modules) even if their behavior is 100% identical to factory.