hi. I have 2 10" used converters that came in cars that I've owned in the past and saved when cars were rebuilt my way. they are both G E R converters.(yes I know) they worked, but I really don't trust using them. so my question is, is it feasable/cost affective, to send them to a converter company to have them gone though, set up for my build, or not? I've actually used 4 of their converters back years ago, & they all 'worked' fine on the street.