lots of good perspectives on this age old question
as a previous owner for 4 years of an e86 si coupe and a test driver of about 4 m coupes
I can only add the following point that I don't think has been touched on:
I find the n52 smoother and less raspy and actual prefer its overall character in this regard to the s54
if you enjoy revving out an engine that has more of a frenzy to it, then s54 is for you
if you prefer a more mellow buttery engine then n52
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