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      12-05-2012, 08:00 PM   #15
Private First Class
Drives: 2014 X3 Msprt, 2014 X5, 1M
Join Date: Nov 2009
Location: PA

Posts: 168
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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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