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I get a similar drone at those RPM's with my Berk Street. I've also noticed it depends on which tune I'm running. The cobb tunes seem to do it a little more than running stock tune and JB4. I played around with logging some of it last year and noticed it did it more in one of the fueling modes either normal or spool I can't remember. I've considered swapping my axle back for a CPE, Maddad or even back to a stock muffler sometimes.
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2008 135i - MHD/JB4, MS DP's, AMS IC, UI CAI, CDV delete, M3 control arms/Links, RE Toe Link, ECS Trailing Arm, M3 rear SF & Trans bushings, SS brake lines, Michelin PSS.
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