I had a 2004 with the 4.4 engine and also I have a 2003 4.6 engine.
My 4.6 at a fast clip in West Texas is humming close to 3 grand.
Plenty-O-Power but slurping down the 93 octane fuel

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2003 4.6is X5
2003 525it
2003 E53 X5 Standard shift