You should keep the 540i/6 and just get an X5 4.6 in addition to it. That's what I did. It's a totally different experience.
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2003 X5 4.6 | 2000 540i Touring
Formerly owned:
2004 Range Rover | 2000 M5 | 2000 540i/6
1995 750il | 2003 Mercedes S500 | 2003 540i/6
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