Quote:
Originally Posted by m2ss
Is that because the S55 has better cooling?
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The N55 in the OG M2 has a few beefed up parts compared to the normal N55. The S55 has been reworked for Motorsport use. It is able to make much more horsepower with just a flash tune without any physical changes to the engine. The N55 on the other hand will need many physical upgrades to pump out a lot more power. If you don't plan on tuning then the N55 is a good motor out of the box. I had one in my M235i, it was plenty fast for street use.