I really don't know exactly how much worse the non-sport setup is, not a lot of reports on it. I guess the big differences are you have slightly smaller rotors, and half the pistons (sport is 4-piston front 2-piston rear, non is 2-piston front 1-piston rear.. which I guess means it's a floating caliper?).
Z1 sells non-sport -> sport upgrade packages, looks like ~$1400+ for the whole car to do it depending on the options you pick. Most of the name-brand BBKs I've seen are double that price or more for doing front+rear, in the ballpark of $4-7K.
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