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I've tried everything on my N54 (PE, Magnaflow, deleting the mid cats) and finally got the exhaust tone I wanted with the VRSF big downpipes. Before the DP's I had a nice growling at idling but as soon as I stepped on the throttle the sound would die out.
The N55 is louder than the N54 (less restricted midpipe) so I'd advise going catless downpipes first and choosing the right muffler for you after that.
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