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Welded shut the pipe with the 3 large holes and the pipe with the perforated smaller holes. The car sounds amazing! So good under load with a nice mellow tone all around.
N55, stock downpipes, stock resonator. PPK tune.
There is more bass down in the 1-3K RPM but nothing I would consider droning. Best bang for the buck mod on this car.
I'm considering adding the PE y-pipe to delete the resonator. Anyone else running that with the PE modded muffler but stock downpipes on a N55?
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'16 M3 | '23 718 Spyder
Past: E92 M3, F87 M2, E39 M5, etc |