This is the SSC Tuatara. This car could be the first in the world to break the 300mph record for a street legal production vehicle. This will be attempted in the coming few months. Either way, they want to take back the title for World's Fastest Car from Koenigsegg who currently hold the title with the Agera RS. To their credit, they have already once achieved the Guinness World Record in 2007 with the previous model, called the Ultimate Aero!