I am thinking about buying a mustang that had an ati procharger on it. The guy who has the car sold the supercharger and FMU that was with it. I want to run without the charger and I know I will need to change the injectors to 24#'s to accomidate the 331 I will be putting in it. The question is, how can I tell if the car has a tune or if the FMU was all that was added to accomidate the blower? I am concerned as if I put the motor/24# injectors/ and matching maf in without the blower that the computer will still think the blower is on. Is there a way to tell? Thanks.