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Pure stock the N54 is stronger than the N55 even thought BMW rates them the same. The N54 also reacts better to mods than the N55. Finally the N54 got its act together around 2010 & has been reliable since.
Other extras. Outside of the 335is, 1M & similar the very early N54's are stronger than later versions, but have more reliability issues with supporting hardware.
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Kevin
Dravit Gray, Black Leather, Moonlight Roof, Red Calipers
2022 M4C - 2020 Z4 M40i - 2023 FORD Expedition XLT Max 4X4 400BHP - 2009 V-Star - 1998 Ranger 4X4 5MT - 1965 Cobra (R) 5MT - 2023 Jeep Wrangler Sport S 6MT |