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I had the Berk Race Cat-back exhaust installed yesterday on my 2013 135i Convertible, by Will at Performance Race Solutions in Sanford FL. It sounds perfect to me and there is zero drone at any speed, which was up to about 110 on I-95 coming home. I listened to just about every option before I decided and am glad I went with the Berk, and the price was just over $400 shipped for the polished version. I do not think it is too loud; my wife likes it as well.
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