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I don't know why some of you are being a dick to the OP when he is down or just plain trying to scare him...
OP, I DOUBT you'll need a new engine.
Put it back to stock, be upfront with the dealership and tell them you were tuned and see if they can help. They won't touch the car at all if you go in with downpipes and tune still installed. I'm sure BMW knows there are issues with the crank hub and they'll probably help you out.
Worst-case scenario you need a new engine and they deny you, have it towed home and get a low mileage used long block from eBay for between $6-7k, if you're mechanically inclined DIY and swap it out yourself or find a good indy shop. You should be back on the road for probably 75 percent less than what BMW will charge you.
Keep your head up and good luck!
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