In a world where excess luxe is hardly earmarked, exists an automotive wonder which dwarf everything else - the Mercedes-Maybach Exelero. By its sinister outline and an eye-watering price of $8-million, this unique coupe has become the poster child for free-spirited hedonism and exclusivity. Designed with great care and attention to detail, the Exelero is nothing less than amazing proof of Mercedes-Maybach's excellence in engineering fashion. And it is also the ridiculously fast with a 12-cylinder engine - front-mid V12, to be exact - and the high-level luxury of a one of most comfortable and luxurious interiors on the road. But the Exelero's real standout feature is its extreme rarity. Featuring bodywork…