How does the BMW N54 compare to the N55?

The BMW 3.0 N55 engine only came a few years later than the 3.0 N54, and both had much the same power output, so what are the differences between the two?
AOL

BMW N54 Engine: History, Specs, Problems, and Why Enthusiasts Still Love It

The BMW N54 engine is one of those rare modern powerplants that arrived with a bang and never really stopped making noise. The N54 motor debuted with a mission: to combine BMW's traditional inline-six ...
The Daily Dot

‘I have no idea how to explain this to the client’: Man buys BMW. Mechanic can’t believe the state it’s in only 2 months later

Mechanics see some pretty incredible stuff, but this used BMW N54 engine's state has this garage owner in a state of shock. Featured Video The mechanic regularly posts his repair stories to TikTok. In ...