check the crossmember, alot of exhausts tend to sit very close to it and are probably vibrating against it, its a pretty noisy occurance.
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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs
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