In terms of getting what you want, you'd want a small turbo setup if the goal is low end torque. But, again, I'd advise against this. You're going to spend a lot of time fighting it.

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2011 M3
2006 Sierra 2500HD 4WD LBZ/Allison
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1990 325is
1989 M3 S54B32

Hers:
1989 325iX
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