I have both S65 & N55. I love to drive my M3 when there is not that much traffic around. The power of the NA is delivered more smooth and more direct. As a driver, it seems almost like you are having total control of it.
The N55 from 135i is fast and I enjoy the low-end rmp torque for sure. But it is just not as sophisticate as the M3 and its NA engine.
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Must stop eating..............
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