Koenigsegg makes its first appearance on our list with the CCXR Trevita, and it does so as the most expensive street-legal production car in the world. Why so much coin? With no exaggeration, the car is literally coated in diamonds â€¦ and diamonds arenâ€™t cheap. For the Trevita, the Swedish manufacturer developed a new exterior finish called the Koenigsegg Proprietary Diamond Weave, which involves coating carbon fibers with a diamond dust-impregnated resin. We canâ€™t even fathom how much the touch up paint costs. Underneath the lustrous finish lies a 4.8-liter, dual-supercharged V8 with a total output of 1,004 hp and 797 lb-ft, which means it should have little to no trouble overtaking semis on the freeway. The carâ€™s specifications â€” in both performance and price â€” are nearly comical at this point, and just three were ever made.