I don't think it's a coincidence that so many E53 owners get here after owning an E38 or E39. Just seems like a natural progression I guess. The fact that OP has both his BMW's in manual shows that this guy's been hunting for quite some time. Welcome here OP.

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2002 X5 4.6 IS (Imola on black)
2001 740i M-sport (Alpine on black)
2000 540it M-sport (Titanium on grey)
1995 540i/6 (Hellrotted like a MMM)