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V10 in an E90 has been done before, but you wont just be doing the engine. If you want it to handle anything like an M3 you'll have to swap out all of the Suspension components including rear subrame, bushings, control arms, tension rods, not to mention shocks and springs.
You'll need to custom fabricate a lot of things including headers, probably a new oilpan as I am not 100% sure the pan on the E60 V10 will fit in the E90.
I'd be interested to subscribe to the thread to see how it goes though if you do decide to proceed
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