BMW X3 M

File this one in the "highly speculative" category for now, but also in the "highly tempting" sub-folder. For those familiar with the absolutely stunning performance of the BMW X5 M and X6 M, the idea of a smaller, lighter, triple-turbocharged X3 M is breathtakingly cool. Yes, that was three turbos mentioned. As crazy as it may sound, that's the rumor flowing out of the U.K. via CAR today. The three turbos will be piped into a massaged version of BMW's familiar straight-six--likely meaning a 3.2-liter displacement--and will generate a claimed 449 horsepower. So how would the three-turbo setup...