These Flowmaster resonators fixed the drone on my 6.1 Hemi Cuda with 2.5" TTI headers & exhaust. https://www.holley.com/products/exhaust/builder_components/resonator/parts/15150S

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1970 Superbird 440-6bbl, auto
1969 Barracuda 340-4bbl, FB Formula S auto
1969 Barracuda 6.1 L Hemi, 5 speed, Convertible
2022 Can Am Spyder RTL