That's what I've always understood a resonator was-an component in the exhaust system in addition to the muffler to help quiet the exhaust ..But in the 11/28/1962 memo, Studebaker refers to the muffler option not specifically as a resonator, but as a resonator "type" and resonator "system", so that must have been 'Studebaker-speak' for a quiet muffler..