1967 Dodge Dart 273 question factory single exhaust/

MidnightSwinger said

My 67 Commando sounds better with duals. The factory exhaust sounded like a truck to me.

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Was the factory exhaust the HiPo version with the Large 2.5 in headpipe, straight through muffler, larger 2.25 over-the-axle pipe and straight through resonator. Anything else won’t sound the same.