I think you need to decide what you are looking to get out of the car you are purchasing. These 2 cars are really worlds apart and I'm a little surprised at the comparison. I considered a BMW before buying the Z but it was a 335i - which in that case at least you can say they are both performance cars so it makes some sense to cross-shop them.
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F.I. / K&N / 180 / Forgestar 
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