Uhh. You've already decided upon a 7-series long wheelbase model.
Perhaps you mean: which *motor* should I buy.
In the US you only get two choices: the 4.4l V8 and the 5l V12
(and I'm not sure the V12 was offered in '01). Now, if you're in
Europe, the choices are greater: a 3.5l V8 was available I believe,
and possibly even the 3.0l I6.
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