There may be exceptions but I haven't heard of any swap that isn't some level of nightmare due to harness, ECU, exhaust etc. etc. differences. Suggests quite high level of DIY knowledge is needed. I think it is best to mod to the max the devil you know.

There was a thread some time ago where someone was swapping in a LS1 Chevy engine. Last I knew it was still in progress.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas