N54 will net you more hp due to the twin turbo setup.
N55 is a torquey motor but it's single turbo runs out of air.
So if you're looking to make the most power, n54 is the motor you want.
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2017 MB C63 S Coupe - DINAN | MODAL WORKS
retired: GranTurismo MC, Giulia Quadrifoglio, B8.5 RS5, Q60 RedSport, e82 135, F80, e92 M3, e90 M3, (2) e92 335, B8 S4, C209 CLK55 AMG, e46 330
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