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Just about all aftermarket mufflers drone from 2,000-3,000rpm. However, a friend once put it that if you're in the drone zone, you're at too low a rpm, so it's kind of an inadvertently useful warning tone. I try to keep my rpms above or around 3k anyways; some people in the Porsche community say cruising around at 2,000 is lugging around and even downright engine abuse. The only purportedly aftermarket mufflers that don't suffer are the Dansk & Fabspeed exhausts.
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