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Did you replace the muffler with any type of resonator or straight pipe it? I've done muffler deletes on both my 328i sedan and wagon without issue, but I put in a 12" Vibrant resonator in both cases. The whole reason I did it was for back-pressure as I read deleting the muffler might cause a loss in low-end torque. Might be worth adding one if you haven't already.
That said, it sounds good with the burbles!
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