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Dack this is very interesting.
Recently I picked up a set of N54 mid pipes which had the cats gutted (ie cut open, cleaned out and welded back).
I felt like the car went backwards in performance. It made no real difference but it just didn't feel or sound like an improvement.
I can see now that the resonator would have been active on this n54 midpipe compared with the oem 1M. I removed one restriction but added in another.
It also didn't really do much to the drone, so I personally wouldn't recommend n55 mids for the 1M.
I'll be installing Berk mids in a week and see what that does.
Thanks again for the info, you're always a wealth of information.
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