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FlyhighDid you work out what the exhaust on your M code was from factory? Have exactly same build (except Dec build T code).Still have factory manifolds which come down to resonators like the 69 Mach 1 351w but then finishes out as per 70 428 Mach 1 on the Fuller site (ie without a central muffler as per 69 351w)
Prior owner might have used what was available at the time - a 69 system since a 70 would not have had resonators.BTW when was you car finished ?
18 Dec 69 Metuchen.