I just went through the same thing. The rasp was normal but I wasn't expecting it. The motordyne XYZ Y pipe will get rid of it. I installed mine last night and it is perfect. It gets rid of the "bumblebee in a can" sounds.
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09 Black 7AT Sport, UpRev, Koni, Swift, Whiteline, Motordyne XYZ, Stillen HFC/Exhaust, Stillen 25 row, Pioneer, Infinity
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