If you love McLaren's 675LT Spider but wish it were constructed entirely from carbon fiber, you're in luck. Well, at least you would be, if you already agreed to buy one.

That's because British supercar-maker McLaren has already pre-sold every single one of the 25 limited-edition MSO Carbon Series LTs it plans to produce.

If you're not yet impressed, wait until you hear the selling price: $515,000. For that large lump sum, buyers get a 666-horsepower supercar with a unique gloss finish.

Yes, the LT was already mostly made from carbon fiber. However, this MSO Carbon Series features 40 percent more carbon than before. As such, it required extra development by McLaren craftsmen.

Though certainly admirable that McLaren put a little more elbow grease into this limited-edition machine, some millionaires and billionaires might not be too happy about the change.

That's because if you have one of the 500 non-MSO Carbon Series 675LTs at home, you cannot just fit the extra carbon parts to your car. They won't fit. So you're stuck with your only sort-of-exclusive carbon-ish supercar.

For the 25 of you who did the chance to buy the MSO Carbon Series LT, you should begin to receive deliveries before the end of the year ... you lucky so-and-sos

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