Flowmaster drone solved.

mopowers said

If you like the sound of the flowmaster 40s, but don't like the drone, I'd recommend Pypes Street Pro muffler. Plus they're stainless and have a lifetime warranty. And no, they don't pay me - lol

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I used the the Pypes cat back system with the violator mufflers on my 10 mustang V6 and it had a hell of a bad drone 1800 to 3000 we added in some 15" stainless steel packed Resonators and that helped a lot but I would have used an H pipe instead on an X pipe don't like the sound of the X pipe