IMHO if you live anywhere above 5000' a turbo car is the only way to go. I've driven over Eisenhower Pass (11,150') on numerous occasions and the difference between a N/A car and a turbo is night and day. I've been in 300+ hp n/a cars that required multiple downshifts to maintain speed. While I've gone over the pass in ~200 hp turbo motors that purred right up the mountain all while keeping the RPMs decently low.
I haven't driven the X3 over the pass yet but we did take it up the Mt. Washington auto road in NH and it was never at a lack of power. It pulled nicely at low rpms (this ZF 8 spd in normal mode HATES to downshift).
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