People seem to be focused solely on the subtle cosmetic changes and power boost, not taking into account the legendary chassis tuning Alpina is famous for.
Their formula is no different for the XB7 from what I've heard. They took a top-heavy pig on ice and turned it into a slightly slimmer and more nimble pig on ice.
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If they would nix the 3rd row seating in favor of expanded legroom for the 2nd row I'd buy one tonight without hesitation.
Nobody does sophisticated hotrod quite like the folks at Alpina.