Depends on what year donor car you are getting . You don't need any emission systems ( check your local or state laws ) for your Z , it's too old . My state , TX , has emmision exempt on cars that are 25 yrs or older . Emission systems like EVAP , catalytic converters , EGR , and secondary air injection . You can get the tuner to delete those systems and codes related to them . And anti-theft system must be removed from the ECM so you can start your motor .