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I have both MPE and test pipes and I can tell you it has some rasp between 3500 to 5000 rpm. It seems to fade away or get drowned out as the engine really starts to scream. I love it and I am not a fan of raspy exhaust notes.
On a side note I do get a very small amount of drone in 5th and 6th at sub 2000 rpm as well.
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