This seems like a hell of a lot of cost, effort and risk for not much result. Why not raise it up half an inch and probably get close to the stock alignment range with the durable stock parts?

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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