If it only has one then it wont matter if convertor is removed I believe. The obd1 computers especially the first year magnum is so primitive, it probably could care less either way.
Forget about superchips or hypertech or that other BS. Just email hemifever@aol.com and get an SCT tuner, either he can or you can write unlimited tunes for your truck if you get the unlimited tuning from him.
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