I'm sure this has been asked or discussed before, but I apologize for asking again. Looking to get a 2011 335i with the N55 engine. I've heard that the N54 is more tuner friendly, but it is prone to having issues with maintenance and reliability. I've heard that the N55 is less tuner friendly, but more reliable. Is the N55 engine still pretty bad in the reliability department in the grand scheme of things? What are some common problems with it? Anyone have any experiences with it? Thanks
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