If you're looking to pay someone else to do it, you're talking $15k to do a decent job. Likely more. The M54B30 swap would make a lot more sense since there's zero brain damage.
It's really not practical unless you are absolutely committed to it.
I don't really have thoughts on who to use.
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2011 M3
2006 Sierra 2500HD 4WD LBZ/Allison
2004 X5 3.0i 6MT
1995 M3 S50B32
1990 325is
1989 M3 S54B32
Hers:
1989 325iX
1996 911 Turbo
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