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I had the same search criterion: solution is a simple swap of the mid pipes (to N55's). I have the stock axle back and no other crazy mods, the result is a significantly reduced if not eliminated drone... If you TRY to identify it there is a HINT between 2100-2300 rpm. There is also a subtle volume increase which sounds better from the outside of the car. All in all it's a simple, cheap, easily accomplished mod that increases your driving pleasure ESP at cruising speeds.
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