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If you have to replace it drop the V8 in there or for 23k have a LS7 dropped in it. A rod on a N55 sounds super suspect. Sounds like a bad tune that wasn't be monitored. Check with the guys in e9x and F30 N55's and see if they've had this issue and how they dealt with it.
If it wasn't a bad tune, possibly see if the ecu was faulty and therefore it might be BMWs fault. If there was a shitty tune in it, then you have to prove that the dealer sold it to you like that. Sorry man, best of luck.
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