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Originally Posted by ynguldyn
Sorry to disappoint, but my source has never been wrong. The only thing that's not guaranteed is transition from engineering to production: not every car makes it. But if the source says N55 - it will be N55. I'm willing to bet real money on this.
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Most on this thread have missed your link in your OP that mentions that this will be a higher tune rendition of the N55 to be shared with the X4 40i and I'm guessing other future 40i designated M performance models (maybe an M440i)