I had something like that happen to my truck. Noise in one muffler. Was told it was valves but it turned out to be bad baffles in the muffler itself.
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93 GT, 5.8 EFI usual bolt ons, 3.55's, subs, hurst, K+N
78 F100 Short bed, 5.8, dual pipes 4 bbl
03 Sable
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