"In a proper race stock vs stock on a track, I'm pretty sure it will be a very close race considering the only difference between the two cars is the torque. However with a torque of 260 vs 230, the 2012 528i may be coming out of a corner a little faster than the 6 cyl."
Keep in mind the number of times you'll be able to go around the track without high-temperature related issues, for a short spurt surely the turbo-4, but for a longer race i'd put my money on I6 (or any NA engine) any day.
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