exhaust drone/harmonic resonance

Does everybody with the drone on this thread have an automatic trans? This is my first automatic car and the only one that has ever had a drone. Just a thought. I would be curious to see.

Yup, a 727 trans , 383 Engine, daily driver..

Schumacher Tri-Ys, Flowmaster 40s + H Crossover = No Drone at any RPM.


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