It's only a concept, but my, what a concept it is. The Lamborghini Sesto Concept ($TBA) is setting a new bar for lightweight supercars, thanks to advanced carbon fiber technology construction that gives it a curb weight of just over 2,200 lbs. — and that's including its V10 engine and permanent all-wheel drive. And while the V10 outputs "only" 570 hp, that's still good enough for a 1.75 kg per hp power-to-weight ratio and an insane 0-62 mph time of just 2.5 seconds. If you're wanting to get your hands on one, you'd best wish for A.) Lamborghini to make it and B.) some sort of financial windfall, because this thing isn't gonna come cheap.