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1999 F150 5.4. my exhaust setup is true duals WITH ALL 4 CATS, and no mufflers. the passenger side flutters and just doesn't sound right and to me it's extremely aggravating. how in the world do I fix this ?
Please explain what you mean by flutter. Do you mean like the motor is misfiring? Like Blu said, you should have a crossover pipe between both sides as well.