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I can see that. Coming from first a 328i and then a 335i, I loved the low-end torque of the twin turbo, but I found the NA engine to be noticeably smoother in power delivery. I drove the 523i and that worked so well with the 8sp sport that I ordered the 528i without driving. To be honest I haven't driven the N55 engine (had the N54) but after the 335i, I promised myself to try to get a BMW NA engine if possible. Now I did drive the 750i which shares the same engine as 550i and that engine was smoother than N54.
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