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My gibson dual in out muffler sounded like crap too, I installed a Magnaflow bullet in each pipe before the muffler to take out all that tinny, rattling, raspy noise.
there LPP headers.you cant reallytell it on the vid but it has a real bad WOOSH sound to it and sounds really bad.
ill be putting my gibson muffler back on tommorrow and see how it sounds.
over all im happy with the headers