I feel as though this debate will rage on with 1 and 3 series owners for years to come. N54 vs. N55. In a previous post
2009 BMW 135i N54 vs. 2011 BMW 135i N55: Round 1 I gave some background and showed a dyno comparison plus a first blood street race result. The information I'm about to spew forth muddies the waters just a tad.