BMW N54 vs. N55 Comparison: Horsepower, Reliability, …
BMW's N55 engine began production in 2009 and started replacing the N54 in 2010. However, most applications built in 2010 still carried the twin turbo N54. The N55 officially replaced the N54 in 2011 (with the exception of the 1M and Z4 35i). Although the engines have many similarities this post will highlight the key differences between the two.
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