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My guess is weight. They could have gone with a B58 but I guess it didn't cut it for the "tuner" aspect and reliablity to handle the power (even though I think the B58 has decent potential).
And an off the shelf +400hp BMW engine would have weight too much and ruined the handling aspect of the MKV specially if it was iron.
The middle ground was a light weight CGI "B58". That's my opinion anyway.
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