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Originally Posted by Fitz335
N55 does not sound better than an N54.
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Most would disagree with you. It's hard to get past the raspy sound of the split exhaust manifold and two turbos (the S55 sounds even worse). The N55 and B58 sound like amped up naturally aspirated I6s because of the six exhaust ports discharging through one single turbo.
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Also the n54 had forged internals from the beginning so BMW actually took a step back with the original n55s.
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A fully forged N54 is all speculation and something that has been proclaimed since the time of the N54, but never once proven with documentation that it actually equipped with all forged internals. Some earlier N54s have forged cranks, they all have forged rods (like most every other BMW), and they all have non-forged Hypereutectic pistons just like the N55 and B58. The N54 and N55 have open deck alum blocks, which are nearly identical except for some improved oil distribution jackets. The B58 is a closed deck alum block as it shares its block with the turbo diesel I6. The N54, N55, and B58 have alum heads.