Hi, im new to this site, but i have a large back ground in exhaust. to me it sounds like what you are hearing is exhaust resinance. my 03' Mach does the same thing, it also became a little louder when I installed my Dr. Gas x over, do to more exhaust flow. its just those cheesy ford mufflers. Im switching my cat back to Borla stingers, and I will let you know if it goes away.
By the way the Dr. gas x pipe is awesome!!!!!!!!!
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..Carrol Shelby..
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