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I dont think anyone has tested either motor to its limit. The limiting factor for the N55 was the turbo until a few months ago. People are making more and more power with it every day and I haven't seen one blow its top yet, but this is the only BMW forum I browse so I'm not 100% sure. I do know BMS was making >460whp on an N55 as of December, pretty sure they were on stock internals
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