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IMHO:
N55 is perfect for those who want to eliminate drone but want to have more noise when under load. I often describe the Akra system as a "controlled" drone. It is the perfect exhaust note for the N54, but indeed is a very specific and controlled note/drone. To have a turbo'd/ force induction vehicle loud W/O a drone is near impossible IMO. If you want it loud, you need to accept drone and be more open to drone. Especially, I have noticed with any turbo charged BMW,(driven a few new loaners recently) there is a turbo hum/ drone in the low RPMs regardless. That is my 2c based on my experience not what I have read etc. A "you can not have your cake and it it too" sort of thing...
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