Putting and banging does not sound normal to me. Is your muffler close to the frame? Exhaust leak? Maybe your driveshaft is out of balance. My 65 stang has flows on it and they sound great. On my 92 GT when I first installed them, it hit the frame. You could definately tell.
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92 GT, 4:10 gears, centerforce clutch, 6# powerdyne blower, bbk h-pipe, flowmasters
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