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It is possible that it is loud because of the damper. I know I have it on my Z4's stock exhaust. And also I know exactly what you are talking about between 2000 and 3000 RPM. Even though I have the damper, at slight acceleration the muffler is quite noisy between 2000 and 3000 RPM, which is sometimes good and sometimes bad (depending on how stressful was my day). I am planning on getting a SS muffler and I hope the drone in that range is not going to be lauder than the stock.
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